Se ha denunciado esta presentación.
Utilizamos tu perfil de LinkedIn y tus datos de actividad para personalizar los anuncios y mostrarte publicidad más relevante. Puedes cambiar tus preferencias de publicidad en cualquier momento.

Power vc for powervm deep dive tips & tricks

Power vc for powervm deep dive tips tricks

  • Sé el primero en comentar

Power vc for powervm deep dive tips & tricks

  1. 1. Technical University/Symposia materials may not be reproduced in whole or in part without the prior written permission of IBM. 9.0 PowerVC for PowerVM Deep Dive Tips & Tricks Benoît Créau Aix System Engineer @chmod666 chmod666org http://chmod666.org benoit.creau@chmod666.org
  2. 2. Student Guide & Workshop & Internal Training & Confidential Update Daily https://goo.gl/VVmVZ0 AN304G00 - Agenda http://ouo.io/eZPF1Q AN304G01 - Introduction to partitioning http://ouo.io/2ELAlA AN304G02 - Processor virtualization http://ouo.io/tcsBj AN304G03 - Integrated Virtual Ethernet http://ouo.io/6ia3L AN304G04 - Virtual Ethernet http://ouo.io/SFbzl AN304G05 - Virtual IO Server and virtual devices http://ouo.io/BJCzjT AN304G06 - Virtual network configuration with dual VIOS http://ouo.io/UcHMx AN304G07 - Virtual SCSI configuration with dual VIOS http://ouo.io/QeBxTo AN304G08 - N_Port ID virtualization http://ouo.io/icDMSL AN304G09 - Migration from physical to virtual storage http://ouo.io/1UA82i AN304G10 - HMC Service Management http://ouo.io/08NSIj AN304G11 - PowerVM advanced systems maintenance http://ouo.io/wRSzJ 2© Copyright IBM Corporation 2015
  3. 3. whoami • AIX/PowerVM System Engineer working in Large french banks • Passionate about AIX and Power Systems • Blogger since Feb 2010 – http://chmod666.org • Creating tools for AIX an Power – Github : chmod666org • Sharing my daily life as a sysadmin on Twitter (tips and tricks, blog post) – @chmod666 • Recently Redbook author: PowerVC 1.2.3 Introduction and configuration (www.redbooks.ibm.com/redpieces/abstracts/sg248199.html? Open) © Copyright IBM Corporation 2015 3
  4. 4. Agenda • Part 1 - Network management • Part 2 - Storage management • Part 3 - Datasource/activation • Part 4 - Disks PVID • Part 5 - cloud-init • Part 6 - sys0 attributes ghostdev/clouddev • Part 7 - Using openstack commands • Part 8 - Rest api • Part 9 - Linked clones • Part 10 - Dynamic Resource Optimizer © Copyright IBM Corporation 2015 4
  5. 5. PowerVC network management • Shared Ethernet Adapters: – PowerVC add and remove vlans from the Shared Ethernet Adapters. – If a VLAN is needed on a host PowerVC add the VLAN on the Shared Ethernet Adapter: • At deploy time • At migrate time (Live Partition Mobility) • At restart time (Remote Restart Operation) – If a VLAN is not needed anymore PowerVC removes the VLAN from the Shared Ethernet Adapter: • Same conditions as above (deploy, migrate, restart) • PowerVC can create Virtual Ethernet Adapters and add it in the Shared Ethernet adapters if needed • PowerVC can remove Virtual Ethernet Adapter from the Shared Ethernet Adapter © Copyright IBM Corporation 2015 5
  6. 6. PowerVC Network Management : Forget your conventions • Don’t prepare a slot numbering convention as PowerVC can add or remove the Virtual Ethernet Adapters • Advice: Do not create SEA with more than two VEA. Automatically added by PowerVC (PVID 4094) No custom buffers on this interface Output of lsseas korn shell script (https://github.com/chmod666org/lsseas) © Copyright IBM Corporation 2015 6
  7. 7. PowerVC network management : SEA buffers • Using the chdef way: # chdef -a min_buf_tiny=4096 -c adapter –s vdevice –t IBM,l-lan # chdef -a max_buf_tiny=4096 -c adapter –s vdevice –t IBM,l-lan Same for min_buf_small=4096 max_buf_small=4096 min_buf_medium=512 max_buf_medium=512 min_buf_large=128 max_buf_large=128 min_buf_huge=128 max_buf_huge=128 • Using the Virtual I/O servers rules ( >= 2.2.4): # rules -o modify -t adapter/vdevice/IBM,l-lan -a min_buf_tiny=4096 # rules -o modify -t adapter/vdevice/IBM,l-lan -a max_buf_tiny=4096 # rules –o list [..] adapter/vdevice/IBM,l-lan max_buf_tiny 4096 adapter/vdevice/IBM,l-lan min_buf_tiny 4096 # rules –o diff –s # rules –o deploy [1] Warning #7 (0590-206 A manual post-operation is required for the changes to take effect): Please reboot the system # shutdown -force -restart © Copyright IBM Corporation 2015 7
  8. 8. Disabling vlan addition/removal (automated_powervm_vlan_cleanup) • PowerVC 1.2.3.1/2 bug: PowerVC forget to keep at least two VEA for Shared Ethernet Adapter in sharing mode • Some customers wants to disable this feature: – Keep their numbering convention – Avoiding removal of the next to last VEA • Using openstack-config: # openstack-config --set /etc/nova/nova.conf DEFAULT automated_powervm_vlan_cleanup False # openstack-config --set /etc/nova/nova-828642A_10D6D5T.conf DEFAULT automated_powervm_vlan_cleanup False • Modifying nova.conf : # grep automated_powervm_vlan_cleanup /etc/nova/nova.conf automated_powervm_vlan_cleanup = False # grep automated_powervm_vlan_cleanup /etc/nova/nova- 9117MMD_659C5FF.conf automated_powervm_vlan_cleanup = False © Copyright IBM Corporation 2015 8
  9. 9. Disabling vlan addition/removal (automated_powervm_vlan_cleanup) • Any configuration files modification = RESTART POWERVC # powervc-services restart © Copyright IBM Corporation 2015 9
  10. 10. VLANs: be careful when adding new hosts! • Adding a host on PowerVC does not automatically set which SEA will be utilized for a particular VLAN. • When adding a host, be carefull modifying all your existing VLAN to match the SEA configuration ! • PowerVC will use the first founded one ! • This can result in propagating a VLAN in the wrong network vswitch (deploy, LPM errors) © Copyright IBM Corporation 2015 10
  11. 11. Zoning: How many zones will be created • Number of zones created depends of: – Storage connectivity group (easy to understand) • NPIV Fabric Access Requirement. • VIOS Redundency for volume Connectivity – Storage Templates: • Use all available WWPNs for attachement (very very important option) ( next slide) This will decide how many ports will be zoned on your storage array © Copyright IBM Corporation 2015 11
  12. 12. Zoning: « Use all available WWPNs » (SVC) • Option not checked – Both nodes will be zoned but not for each WWPNs – One zone per WWPN – For instance 4 NPIV adapters = 4 zones – No spof / Multi fabric – Warning on the SVC Best practice on AIX: Use 4 or 8 paths, exceptionally 16 (too much paths can result in huge performance issues) © Copyright IBM Corporation 2015 12
  13. 13. Zoning: « Use all available WWPNs » (SVC) • Option checked – Both nodes will be zoned for each WWPNs – Many zones per WWPN – All SVC available ports will be zoned – No spof / Multi fabric – Too many zones ? © Copyright IBM Corporation 2015 13
  14. 14. Zoning: FE Ports spreading • By using a algorithm based on: – The number of ports that can be zoned – The name of the Virtual Machines • PowerVC will spread the zoning on each available ports: Virtual Machine 1 Virtual Machine 2 • In version <= 1.2.3.2 PowerVC just use the four first ports available on the SVC. • Ask for patch, open a PMR to get it. © Copyright IBM Corporation 2015 14
  15. 15. Storage: Good to know • Machines with no storage templates (adopt using « manage existing » button): – Use the default storage template (depending on the storage provider) – When you’ll add a new LUN (from a different storage template) it adds new zones to an existing VM • Be very careful when creating VMs: – PowerVC can create new zones on a existing VM but can not remove a part of this zones (ie. all zones will be deleted at the VM deletion, but you can’t remove zones if you made a mistake when choosing a storage connectivity group or a storage template). – If you notice that you choose the wrong storage template for a VM you can add a new lun in the new storage template and all the existing lun will use the new zones (just cfgmgr). © Copyright IBM Corporation 2015 15
  16. 16. Openstack data-source used by PowerVC 1/4 1. The user enter ip address, the hostname, … in the GUI 2. A iso image is created on the PowerVC host (glance is doing that) 3. This iso is transfered on one of the Virtual I/O Server (POST rest api) 4. By using Virtual Optic devices the iso is attached to the virtual machine 5. The machine is created 6. cloud-init or activation engine is mounting and reading the virtual cdrom and can use the information entered in the PowerVC GUI to setup the Virtual Machine PowerVC server User VM creation IP, hostname, activation input …. - IP - hostname - ae - …. VIOS1 VIOS2 Loadbalanced (to be verified) mount Cloud-init/ae 1 2 3 4 5 6 © Copyright IBM Corporation 2015 16 Created VM
  17. 17. Openstack data-source used by PowerVC 2/4 • For each Virtual Machines created PowerVC create a vscsi adapter used for the virtual optic data source • This adapter can be removed by the user if he wants to. This one will not be utilized anymore after the VM creation • Be careful with VIOS rootvg size (be sure to have enough space in /var to copy the iso, had issue when moving on P8 boot on san VIOS) • What’s inside this iso ? # lsrep Name File Size Optical Access vopt_754df319e3f14cbc979011e2360fc723 1 None ro # ls –l /var/vio/VMLibrary | grep vopt -r--r----- 1 root system 425984 Aug 3 12:36 vopt_754df319e3f14cbc979011e2360fc723 # loopmount -i vopt_754df319e3f14cbc979011e2360fc723 -l loop0 -o "-V cdrfs -o ro" -m /mnt © Copyright IBM Corporation 2015 17
  18. 18. Openstack data-source used by PowerVC 3/4 • Network configuration (cloud-init format/debian style): # cat /mnt/openstack/content/0000 # Injected by Nova on instance boot [..] auto lo iface lo inet loopback auto eth0 iface eth0 inet static address 10.10.10.11 hwaddress ether fa:34:9b:4c:fb:20 netmask 255.255.255.0 broadcast 10.10.10.254 pre-up [ $(ifconfig eth0 | grep -o -E '([[:xdigit:]]{1,2}:){5}[[:xdigit:]]{1,2}') = "fa:34:9b:4c:fb:20" ] gateway 10.10.10.254 dns-nameservers 8.8.8.8 8.8.8.9 dns-search lab.chmod666.org Yes ! Cloud-init use the debian style interface format. Don’t worry it’s his job to translate it for AIX (mktcpip) © Copyright IBM Corporation 2015 18
  19. 19. Openstack data-source used by PowerVC 4/4 • User data (user-data): # cat /mnt/openstack/latest/user_data runcmd: - root_home=$(grep ^root /etc/passwd | awk -F ':' '{print $6}') ; echo 'ssh-dss AAAABBBBCCCC[…]'>> ${root_home}/.ssh/authorized_keys - mount deckard:/export/nim/postinstall /mnt - /mnt/postintall.ksh - /mnt/install_was.ksh - /mnt/install_jre.ksh Running post-install scripts Adding an ssh key This was a Websphere VM © Copyright IBM Corporation 2015 19
  20. 20. The PVID topic 1/4 • To capture the Virtual Machines PowerVC is using: – Snapshot (Shared Storage Pools) – Flashcopies (SVC, Storwise) • To create a new Virtual Machines PowerVC is using these Snapshots/Flashcopies – After the deployments your VM will have the same PVIDs for both rootvg and datavg – This is not an issue! But some customers may want to change this (for instance storage billing can be based on PVID … or stuff like that) # for i in $(cat myvms) ; do echo "==$i==" ; ssh -q $i "lspv | grep -E "rootvg|appsvg"" ; done ==rachael== hdisk0 00c30e8e42c879b9 rootvg active hdisk1 00c30e8e42d0aae5 appsvg active ==tyrell== hdisk0 00c30e8e42c879b9 rootvg active hdisk1 00c30e8e42d0aae5 appsvg active © Copyright IBM Corporation 2015 20
  21. 21. The PVID topic 2/4 • Solution for the rootvg • Did you know changing the sys0 « ghostdev » to 2 and rebooting the VM change rootvg PVID ! • After rebooting the lpar ghostdev attribute will automatically be reset to 0, and rootvg PVID will be changed • Documentation about ghostdev : https://www- 01.ibm.com/support/knowledgecenter/#!/ssw_aix_61/com.ibm. aix.osdevice/change_pvid_vgid.htm • AIX 6.1/7.1/7.2 # lsattr -El sys0 -a ghostdev ghostdev 0 Recreate ODM devices on system change / modify PVID True # chdev -l sys0 -a ghostdev=2 sys0 changed # lsattr -El sys0 -a ghostdev ghostdev 2 Recreate ODM devices on system change / modify PVID True © Copyright IBM Corporation 2015 21
  22. 22. The PVID topic 3/4 • Solution for other VG, use the « recreatevg » command to change all the PVIDs of a volume group • cloud-init shell solution © Copyright IBM Corporation 2015 22
  23. 23. The PVID topic 4/4 • cloud-init cloud-config solution : © Copyright IBM Corporation 2015 23
  24. 24. cloud-init 1/5 • Cloud-init needs a lot of prerequistes. There is a script doing the job for you (https://github.com/transt/cloud-init- 0.7.5/blob/master/cloudinst.sh) # cloudinst.sh • You need an access to internet to run the script. If you don’t have any internet access, install it by hand. (rpm) # rpm -ivh --nodeps gettext-0.17-8.aix6.1.ppc.rpm [..] gettext ################################################## # for rpm in bzip2-1.0.6-2.aix6.1.ppc.rpm db-4.8.24-4.aix6.1.ppc.rpm expat-2.1.0-1.aix6.1.ppc.rpm gmp- 5.1.3-1.aix6.1.ppc.rpm libffi-3.0.11-1.aix6.1.ppc.rpm openssl-1.0.1g-1.aix6.1.ppc.rpm zlib-1.2.5- 6.aix6.1.ppc.rpm gdbm-1.10-1.aix6.1.ppc.rpm libiconv-1.14-1.aix6.1.ppc.rpm bash-4.2-9.aix6.1.ppc.rpm info- 5.0-2.aix6.1.ppc.rpm readline-6.2-3.aix6.1.ppc.rpm ncurses-5.9-3.aix6.1.ppc.rpm sqlite-3.7.15.2- 2.aix6.1.ppc.rpm python-2.7.6-1.aix6.1.ppc.rpm python-2.7.6-1.aix6.1.ppc.rpm python-devel-2.7.6- 1.aix6.1.ppc.rpm python-xml-0.8.4-1.aix6.1.ppc.rpm python-boto-2.34.0-1.aix6.1.noarch.rpm python-argparse- 1.2.1-1.aix6.1.noarch.rpm python-cheetah-2.4.4-2.aix6.1.ppc.rpm python-configobj-5.0.5-1.aix6.1.noarch.rpm python-jsonpointer-1.0.c1ec3df-1.aix6.1.noarch.rpm python-jsonpatch-1.8-1.aix6.1.noarch.rpm python-oauth- 1.0.1-1.aix6.1.noarch.rpm python-pyserial-2.7-1.aix6.1.ppc.rpm python-prettytable-0.7.2-1.aix6.1.noarch.rpm python-requests-2.4.3-1.aix6.1.noarch.rpm libyaml-0.1.4-1.aix6.1.ppc.rpm python-setuptools-0.9.8- 2.aix6.1.noarch.rpm fdupes-1.51-1.aix5.1.ppc.rpm ; do rpm -ivh $rpm ;done [..] python-oauth ################################################## python-pyserial ################################################## python-prettytable ################################################## python-requests ################################################## libyaml ################################################## © Copyright IBM Corporation 2015 24
  25. 25. cloud-init 2/5 • The documentation is aweful (https://cloudinit.readthedocs.org/en/latest/) • Configuration file is located in /opt/freeware/etc/cloud.cfg • For debugging purposes you may want to re-run cloudinit by hand, delete somes files before re-running cloud-init: # rm –rf /opt/freeware/var/lib/cloud/instances/* • Default logs file located in: – /var/log/cloud-init-output.log – /var/log/cloud-init.log • User data file located in /opt/freeware/var/lib/cloud/instances/<XXX>/user-data.txt #cloud-config runcmd: - mount nim:/export/nim/postinstall /mnt - /mnt/install_oracle.ksh - export LIBPATH=/usr/lib ; /mnt/script_install_was.ksh © Copyright IBM Corporation 2015 25
  26. 26. Cloud-init 3/5 • Step 1 (local): cd is loaded, ip, hostname are set. • Step 2 (init): All init modules are launched (rmc, bootlist, vg) • Step 3 (config): All config modules are launched (mounts, chef run, runcmd) • Step 4 (final) : All final modules are launched (phone_home, messages, shutdown) Come join me in my session about Chef on AIX (intermediate/expert) © Copyright IBM Corporation 2015 26
  27. 27. cloud-init 4/5 • Files: write_files: - path: /tmp/cloud-init-started content: | cloud-init was started on this server permissions: '0755' - path: /var/log/cloud-init-sub.log content: | starting chef logging permissions: '0755' final_message: "The system is up, cloud-init is finished" © Copyright IBM Corporation 2015 27
  28. 28. cloud-init 5/5 • Power_state: power_state: delay: "+5" mode: poweroff message: cloud-init mandatory reboot for sddpcm timeout: 5 • chef: chef: force_install: false server_url: "https://cserver.chmod666.org/organizations/chmod666" validation_name: "chmod666-validator" validation_key: | -----BEGIN RSA PRIVATE KEY----- -----END RSA PRIVATE KEY----- run_list: - "role[aix7]" © Copyright IBM Corporation 2015 28
  29. 29. Ghostdev ? Clouddev ? 1/2 • The problem: – When a new machine is created, its rootvg was cloned. To remove the old devices and wipe the ODM the activation is taking care of the ghostdev/clouddev attribute (it’s a sys0 attribute) • If you are using the activation engine: – ghostdev is set to 1, after activation, ghostdev is automatically set back to 0 – It works on all versions of AIX. • If you are using cloud-init: – If you are using AIX >= 7100-03-05 or >=6100-09-05 • Clouddev is set to 1, after rebooting, clouddev is automatically set back to 0 – If you are using another version of AIX • Ghostdev is set to 1, but after rebooting, ghostdev is not automatically set back to 0 • Set manually (or using the activation input) ghostdev to 1 • If you forget to do that any remote restart operation will result in an ODM wipe. • All AIX versions (6.1/7.1) will be supported in the next release of PowerVC © Copyright IBM Corporation 2015 29
  30. 30. Ghostdev / Clouddev 2/2 • clouddev is using a flag is the nvram to check if the ODM needs to be wiped or not # errpt | more IDENTIFIER TIMESTAMP T C RESOURCE_NAME DESCRIPTION CB4A951F 0803171015 I S SRC SOFTWARE PROGRAM ERROR D872C399 0803171015 I O sys0 Partition ID changed and devices recreat • cloud-init on unsupported os: # cloud-config runcmd: - chdev –l sys0 –a ghostdev=0 © Copyright IBM Corporation 2015 30
  31. 31. Using openstack command on PowerVC 1/2 • As PowerVC is based on Openstack, there is a way to use the openstack commands on the PowerVC host. • Create a powervcrc file: # cat powervcrc export OS_USERNAME=root export OS_PASSWORD=mypasswd export OS_TENANT_NAME=ibm-default export OS_AUTH_URL=https://powervc.lab.chmod666.org:5000/v3/ export OS_IDENTITY_API_VERSION=3 export OS_CACERT=/etc/pki/tls/certs/powervc.crt export OS_REGION_NAME=RegionOne export OS_USER_DOMAIN_NAME=Default export OS_PROJECT_DOMAIN_NAME=Default powervc root password powervc url • Source it: # source powervcrc • You can now use openstack commands: # nova list +--------------------------------------+-----------------------+--------+------------+-------------+------------------------+ | ID | Name | Status | Task State | Power State | Networks | +--------------------------------------+-----------------------+--------+------------+-------------+------------------------+ | 394ab4d4-729e-44c7-a4d0-57bf2c121902 | deckard | ACTIVE | - | Running | vlan666=10.16.66.60 | | cd53fb69-0530-451b-88de-557e86a2e238 | priss | ACTIVE | - | Running | vlan666=10.16.66.61 | | 64a3b1f8-8120-4388-9d64-6243d237aa44 | rachael | ACTIVE | - | Running | | | 2679e3bd-a2fb-4a43-b817-b56ead26852d | batty | ACTIVE | - | Running | | | 5fdfff7c-fea0-431a-b99b-fe20c49e6cfd | tyrel | ACTIVE | - | Running | | +--------------------------------------+-----------------------+--------+------------+-------------+------------------------+ © Copyright IBM Corporation 2015 31
  32. 32. Using openstack commands on PowerVC • Reboot a machine: # nova reboot deckard • Migrate a machine (lpm): # nova live-migration deckard 828641A_YYYYYY • List hosts: # nova hypervisor list +----+---------------------+-------+---------+ | ID | Hypervisor hostname | State | Status | +----+---------------------+-------+---------+ | 21 | 828641A_XXXXXXX | up | enabled | | 23 | 828641A_YYYYYYY | up | enabled | +----+---------------------+-------+---------+ • Maintenance mode: # nova maintenance-enable --migrate active-only --target-host 828641A_XXXXXX 828641A_YYYYYYY • Create a machine: # nova create --image 7100-03-04-cic2-chef --flavor powervm.tiny --nic net-id=5fae84a7-b463-4a1a-b4dd- 9ab24cdb66b5,v4-fixed-ip=10.16.66.51 novacreated • WARNING : No PowerVC extension with openstack cmd ! © Copyright IBM Corporation 2015 32
  33. 33. PowerVC Lun order • To remove a rootvg lun from a Virtual Machine this one needs to be in « position » 2. (not 1) • For instance when I’m moving a new machine to PowerVC (from an old host) I’m creating a VM with PowerVC (for profiles,zoning, …). Then I’m mapping « old » luns to this machine © Copyright IBM Corporation 2015 33
  34. 34. Rest API 1/2 • The best way to scripts things on PowerVC is to use the rest API • I warn you: for a system administrator using a rest API can be (at the begining) difficult • My advise is to use Python (json trees can be treated as dict) • I’ve created a few example of how to use the PowerVC rest API : – pvcgrowlun: growing a existing lun (https://github.com/chmod666org/pvcmd/blob/master/pvcgrowlun) – pvcmkvm: creating a Virtual machine with the rest API (https://github.com/chmod666org/pvcmd/blob/master/pvcmkvm) # pvcgrowlun -v multi-vol-bf697dfa-0000003a-828641A_21AFF8V-data-1 -s 84 -p powervc.lab.chmod666.org -u root -P mypassword # cat myvm name:myvm ip_address:10.10.10.2 vlan:vlan666 image:aix7100-03-05-chef storage_connectivity_group:npiv_4ports virtual_processor:1 entitled_capacity:0.1 memory:8192 storage_template:svc # pvcmkvm -f myvm -p powervc.lab.chmod666.org -u root -P mypassword © Copyright IBM Corporation 2015 34
  35. 35. Rest API 2/2 • The most difficult part with rest API is to find the json body you need to create • My advice is to test every calls to the API with RESTClient (firefox plugin) • Check json body with firefox firebug (example with network creation): © Copyright IBM Corporation 2015 35
  36. 36. Copying images between storage providers • When you have a lot of different storage providers (in my case I have three different SVC) you have to synchronize your images between each one. • Step 1: Zone all your storage provider on a host • Step 2: Map your OS Image lun on this host (from the source Storage Provider) • Step 3: Map a new lun (from the desitnation Storage Provider) • Step 4: Use dd to copy the data from on lun to one another. (note the block size) – /dev/mapper/mpathe -> lun of the OS Image (source Storage Provider) – /dev/mapper/mpathc -> new lun (destination Storage Provider) # dd if=/dev/mapper/mpathe of=/data/download/aix7100-03-04-cloudinit-chef bs=4M # dd if=/data/download/aix7100-03-04-cloudinit-chef of=/dev/mapper/mpathc bs=4M • Step 5: Import the new image on PowerVC – Manage the new lun with « Manage Existing » # powervc-volume-image-import --name rhel64 --os rhel --volume volume_capture2 --activation- type ae Password: Image creation complete for image id: e3a4ece1-c0cd-4d44-b197-4bbbc2984a34 © Copyright IBM Corporation 2015 36
  37. 37. Linked clones 1/2 • PowerVC is the only way to created « linked clone » VM • You need to have a Shared Storage Pool as a storage provider. How does it work: – Step 1: The captured rootvg underlying disk is a Shared Storage Pool Logical Unit. – Step 2: When the image is captured the rootvg Logical Unit is copied and is known as a “Logical (Client Image) Unit”. – Step 3: When deploying a new machine a snapshot is created from the Logical (Client Image) Unit. – Step 4: A “special Logical Unit” is created from the snapshot. This Logical Unit seems to be a pointer to the snapshot. We call it a clone. – Step 5:The machine is booted and the activation engine is running and reconfiguring the network – Step 6:When a block is modified on the new machine this one is duplicated and modified on one new block on the Shared Storage Pool. – Step7: This said if no blocks are modified all the machines created from this capture are sharing the same blocks on the Shared Storage Pool. – Step 8: Only modified blocks are not shared between Linked Clones. The more things you will change on your rootvg the more space you will use on the Shared Storage Pool. – Step 9:That’s why these machines are called Linked Clones : they all are connected by the same source Logical Unit. – Step 10:You will save TIME (just a snapshot creation for the storage side) and SPACE (all rootvg will be shared by all the deployed machines) by using Linked Clones. © Copyright IBM Corporation 2015 37
  38. 38. Linked clones 2/2 © Copyright IBM Corporation 2015 38
  39. 39. Debugging PowerVC • Best things to do is to check logs: – All openstack logs are located in /var/log • Nova • Cinder • … • Things I’ve learned by experience: – Check VIOS rootvg /var space (PowerVC need space in /var) – PowerVC needs responsive VIOS. By this I mean if some commands are too long to answer, PowerVC will consider this VIOS as busy and will try a new one. (And indicate it may be an RMC problem in the log) – In the Virtual I/O Server check the logs located in /home/ios/logs • viosvc.log • viod_CM.log (if you have .FATAL files you can check them to find the issue) © Copyright IBM Corporation 2015 39
  40. 40. Backup/Restore strategy • My advice: – Create two Linux hosts (on different sites) – Install PowerVC at the same level on each hosts – If you update one PowerVC update the backup too – On the production one run weekly backups: – Copy this backup on a third host or backup it with TSM – If you have an outtage of the first PowerVC restore the configuration on the second one # crontab –l 0 0 * * 6 rm -rf /var/opt/ibm/powervc/backups/* ; /opt/ibm/powervc/bin/powervc- backup --targetDir /var/opt/ibm/powervc/backups --noPrompt # powervc-restore --targetDir /var/opt/ibm/powervc/backups/ Continuing with this operation will stop all PowerVC services and overwrite critical PowerVC data in both the database and the file system. Do you want to continue? (y/N):y PowerVC services stopped. [..] © Copyright IBM Corporation 2015 40
  41. 41. Dynamic Resource Optimizer 1/2 • Had the chance to participate in the beta test program • DRO is checking host utilization and optimize (rebalance) the placement of Virtual Machine, or of CPU: – By using Live Partition Mobility – By using Power Entreprise Pool (mobiles cores) • DRO can by run in: – Active mode: VM will be moved, cores will be moved. – Advise mode: DRO will advise you in the logs • Specific machines, host, or host group can be excluded from DRO. • For the moment DRO is the checking the CPU usage: – Criteria : Threshold, stabilization, run interval © Copyright IBM Corporation 2015 41
  42. 42. Dynamic resource Optimizer 2/2 © Copyright IBM Corporation 2015 42
  43. 43. Redbook & resources • My blog posts about PowerVC : http://chmod666.org/index.php/tag/powervc/ • Redbook: http://www.redbooks.ibm.com/redpieces/pdfs/sg248199.pdf • Linked-in PowerVC group: https://www.linkedin.com/grp/home?gid=6610502 • PowerVC DW Wiki (best place for documentation): https://www.ibm.com/developerworks/community/wikis/home?l ang=en_us • Twitter: – @IBMPowerVC © Copyright IBM Corporation 2015 43
  44. 44. Thank you ! Special thanks to (for their support or help) - All the PowerVC team in Austin (Joe, Christine, Sam, Gerald) - Jay Kruemcke @chromeaix @cloudrancher - Philippe Hermes @phhermes - Nigel Griffiths @mr_nmon / Gareth Coates @power_gaz - Chris Gibson @cgibbo - Rosa Davidson @radavids1 - Eddie Shvartsman © Copyright IBM Corporation 2015 44
  45. 45. © Copyright IBM Corporation 2015 Continue growing your IBM skills ibm.com/training provides a comprehensive portfolio of skills and career accelerators that are designed to meet all your training needs. • Training in cities local to you - where and when you need it, and in the format you want – Use IBM Training Search to locate public training classes near to you with our five Global Training Providers – Private training is also available with our Global Training Providers • Demanding a high standard of quality – view the paths to success – Browse Training Paths and Certifications to find the course that is right for you • If you can’t find the training that is right for you with our Global Training Providers, we can help. – Contact IBM Training at dpmc@us.ibm.com Global Skills Initiative © Copyright IBM Corporation 2015 45

×