VIOS Shared Storage Pool 6 Reminder of the Basics & Advanced Topics & Demo

Transcription

1 AIX Virtual User Group VIOS Shared Storage Pool 6 Reminder of the Basics & Advanced Topics & Demo Nigel Griffiths Power Systems Advanced Technology Support IBM Europe 2016 IBM Corporation

2 Agenda 2 Info: Benefits, Videos & Blogs, class 101 Reminder Four Frequently Ask Questions SSP phase 5 Tiers reminder SSP phase 6 8 New features Five new-ish free SSP commands from Nigel Under the cover secrets

3 Shared Storage Pool terminology 3 Cluster = set of co-operating VIOSs Pool = set of LUNs connected to the cluster So every VIOS sees every LUN LU = Logical Unit = SSP virtual disk out of the pool Space allocated in chunks of 1MB VIOS vscsi connection to virtual machines: AIX, Linux, IBMi Special LUN called a Repository disk for cluster config Typically, 1 or 2 GB is size. Can be rebuilt in seconds. SSP commands are simple to use cluster, lscluster, lu, pv, failgrp, lssp & tier (new)

4 Shared Storage Pools = SSP 4 We are at Phase 6 which means: Six years of development & releases Lots of concepts & features Covering the basics takes much more than 1 hour Pre-Requistes for this SSP session 1. Technical Uni Session by Linda Flanders 2. Or Power Systems SSP Webinars on Phase 4 mins Phase mins 3. Or 1 years+ Hands-On with SSP

5 Nigel s YouTube Videos 5 ~16,100 YouTube views in total 1. SSP Intro 7 mins SSP2 Getting Started 10 mins SSP2 Thin Provisioning Alerts 17 mins SSP3 New Features 24 mins Looking Around a SSP3 15 mins Live Partition Mobility (LPM) with SSP3 7 mins Recover a Crashed Machine's LPAR to Another Machine 25 mins Migrating to SSP & then LPM 18 mins SSP 4 Concepts 28 mins SSP 4 Hands On 19 mins PowerVC with SSP 20 mins SSP in 3 Commands in 3 Minutes 8 mins SSP Repository is bullet proof 13 mins SSP Remote Pool Copy Activation for Disaster Recovery 23 mins PowerVM VUG 33: VIOS Shared Storage Pool mins Power Systems VUG 50: VIOS Shared Storage Pool 5 90 mins VIOS Shared Storage Pool phase 6 19 mins 269 YouTube search: Shared Storage Pools Nigel Griffiths

6 Nigel s AIXpert Blog topics on SSP 6 1. VIOS Shared Storage Pool phase 6 - New Readme Content 2. VIOS Shared Storage Pool phase 6 - New Features 3. Shared Storage Pools - Migrating to New Disk Subsystem 4. Shared Storage Pools question on two pools? 5. Shared Storage Pool 5 - VIOS upgrade status script 6. Shared Storage Pools 5 - advanced lu -list the search continues 7. Shared Storage Pools - Hands-On Fun with Virtual Disks (LU) by Example * Download my SSP tools from this Blog Views 8. Shared Storage Pool 4 - Best Practice & FAQ * Updated to cover SSP6 13,660+ Views 9. Shared Storage Pools 4 - Growing the Pool using LUN Expansion 10.Shared Storage Pools 4 - Cheat Sheet * Command summary by example 11.How many Shared Storage Pools in the world? 12.VIOS Shared Storage Pool Single Repository Disk = Not a Problem * 13.VIOS Shared Storage Pool phase 4 - How fast is the disk I/O?...

7 Marketing: VIOS Shared Storage Pools 1. Enormous reduction in storage man-power 2. Sub-second disk space allocate & connect a VM lu command: create, map, unmap, remove lu level snapshot: create/delete/rollback 3. Easy to live assimilate a local disk VM for I/O boost 4. Autonomic disk mirrors & resilver with zero VM effort 7 Avoid troublesome Linux mirrors and AIX stale mirror hunting 5. Live Partition Mobility ready by default 6. Simple Pool management: pv & failgrp, lssp, lscluster/cluster, alert HMC logs 7. DR capability to rebuild the whole SSP & a VM quickly 8. HMC GUI for fast SSP disk setup across dual VIOS No more: VIOS slot numbers, Cnn or vhosts 9. Tiers: separate groups of LUNs with different disk properties For mixed SSD/HDD and live migrate VM to different disks 10.As fast as NPIV (takes a little more VIOS CPU but look at the functions you get) 11.Independence from underlying SAN technology & team!

8 SSP Architecture 8

9 SSP5 Webinar 9 Architecture Initial setup = EASY LUNs+Zone & online in VIOSs cluster create cluster -addnode (of each VIOS) failgrp create Have a mirrored SSP lu -create -lu xyz -size 64G -vadapter vhost42 1 st VIOS 1 sec later: disk online in VM lu -map -lu xyz -vadapter vhost66 1 sec later: dual VIOS 2 nd VIOS pv -add more-luns

10 SSP5 Webinar 10 Architecture Initial setup = EASY 3 Advanced Functions LPM by default Adopt old VM into SSP Simple VM recovery

11 FAQ 1: Supported? 11 Are my disks supported by SSP? If supported by VIOS then they are good for SSP webapp/set2/sas/f/vios/documentation/datasheet.html How do I get Shared Storage Pools 6? SSP6 delivered as VIOS fix packs So just upgrade your VIOS Does SSP support NPIV? No it does not, never will and it is impossible! What a silly question

12 FAQ 2: Rate in terms of high speed Disks 12 Local VIOS disk via vscsi LU over SSP SAN LUN over NPIV FC LUN via vscsi

13 Rate in terms of Disk speed 13 SSP NPIV LUN via vscsi Local disk via vscsi Shocking, right! Benchmarked at IBM Montpellier to prove it I/O per second Latency Notes: 1 SSP does take a little more CPU than NPIV but SSP has drastically less SysAdmin time 2 NPIV itself has no automatic mirrors & resilver, sub-second create and assign 3 NPIV disk subsystem might have snapshots, simple cloning, thin provisioning 4 VM with single LU/LUN SSP faster

14 14 SSP5 Tiers - a quick dip

15 Phase 5 November 2015 SSP Tiers (multiple pools, only better) 9 tiers (think disk grouping - not hierarchy of levels) Systems tier (with meta data) or User tier (data only) failgrp (mirroring) at tier level [was whole pool level] tier -create -tier blue: <list of LUNs> lu -create -lu fred -size 32G -tier blue 15 SSP LU move a LU between tiers Command: lu -move -lu vm42 -dsttier blue SSP LU Resize (grow only, saves admin time) Command: lu -resize-lu vm42 size 128G SSP + Tier support in HMC Enhanced+ view VIOS alerts escalated to HMC for Tiers

16 What is good Tier use? 16 It is about the underlying disks Fast, medium, slow highlight the LUNs have different performance IBM, HDS, EMC remind yourself of the underlying disk unit vendor and implications of that Prod, in-house, test make sure you know different policies are in place for the important data V7000a, V7000b you know explicitly which disk unit the data is in to reduce risks Room101 & Room102, datacentre1 & datecentre2 clarify where (geographically) the LUNs are placed Remote-mirror, Local-mirror, Un-mirrored Key: Green Red Blue separate disk remotely mirrored (failgrp in SSP terms), locally mirrored or not mirrored Storage Speed Location Protection(RAS) Bad use of Tiers: rootvg & data VG RDBMS data & logs

17 VIOS tier related command 17 How to mirror a tier? failgrp -create -tier tiername... failgrp -create -tier red -fg mirrorb: hdisk30 hdisk31 How to move a LU between tiers? lu -move -lu luname -dsttier tiername lu -move -lu vm42boot -dsttier red How to grow a tier in size? pv -add -tier tiername pv -add -tier red -fg mirrora: hdisk22 fg mirrorb: hdisk32

18 18 SSP6 What s New?

19 Phase 6 November Available with VIOS th Nov 1. Increased SSP VIOS nodes from 16 to Fully support the DeveloperWorks SSP Disaster Recovery software 3. RAS (Reliable, Available & Serviceable) 3a Cluster Wide Snap Automation 3b Asymmetric Network Handling 3c Lease by Clock Tick 4. lu -list -attr provisioned=<true/false> 5. HMC further GUI support for SSP Arrives with HMC HMC Performance & Capacity Metrics (SSP Performance stats)

20 SSP 6 VIOS nodes 1. Increased SSP VIOS nodes from 16 to In Practice: With the normal Dual VIOSs = 12 Servers Note: Live Partition Mobility within the 12 Servers Need more? Use more than one SSP This limits the failure domain Largely a Test & Support Statement Large effort for SSP development test They assume worst case extremely high disk I/O rates

21 SSP 6 24 VIOS nodes Nigel Notes on SSP Overall disk I/O rates: 21 Low I/O rates = no problem Can go to higher than 24 but it s not Supported Medium I/O rate SSP = no problem May demand higher VIOS CPU + RAM Use VIOS part command to monitor them High or Extreme I/O rate = take care See the VIOS Installation Readme or my notes on it AIXpert blog: VIOS SSP phase6 New Readme Content SYSTEM (metadata) tier on SSD or Flash Monitor whole SSP disk I/O rates (see item 5)

22 VIOS part - checks continue to grow 22 SSP Details

23 VIOS part - checks continue to grow 23 SSP Details

24 2 Disaster Recovery 24 Available for a few years as DevWorks scripts Was at-your-own-risk Now Fully Supported On a site failure you can rebuild your SPP Mirror or remote copy SSP LUN s to other site (using SAN disk subsystem features) Backup SSP config with: viosbr -autobackup Run viosbr -dr to fix up config file to use alternative VIOS nodes, LUN disk names & LU to Virtual Machine mappings. viobr -restore from the fixed backup file New SSP running as on the original site

25 2 Disaster Recovery Check out the manuals for these viosbr options 25 viosbr -dr -clustername clustername -file FileName -type devtype -typeinputs name:value [,...] -repopvs list_of_disks [-db] viosbr -autobackup {start stop status} [ -type {cluster node} ] viosbr -autobackup save

26 Phase 6 RAS: Cluster snap 3a Cluster Wide Snap Automation It seems every PMR s first response from support is: Can we have a snap? Capturing 16 (or now 24) VIOS snaps is... tricky 26 clffdc collects snap data from every node in the SSP cluster Single cluster snapshot (csnap), compressed tar, time co-ordinated See manual pages for details Example: all data and priority=medium As padmin: clffdc -c FULL -p 2 Saves to /home/ios/logs/ssp_ffdc/ snap_ _090336_by_full_med_c33.tar.gz c33 co-ord counter Expect LARGE files so make /home LARGE

27 Phase 6 RAS: Asymmetric Network Handling 3b New internal algorithm Normally, a managing node decides who is in the cluster, who gets expelled & who can join Rare condition: cluster manager has a partial network issue i.e. can communicate with some nodes but not all nodes [asymmetric] 27 The managing node is one of the VIOS & moves around as VIO Servers start & stop Now the manager node double checks if the good nodes can talk to the missing nodes Result: during flaky network issues, we get fewer unnecessary expelled nodes = SSP stability While you fix the network.

28 Phase 6 RAS: Lease by Clock Tick 28 3c Lease by Clock Tick The SSP VIOS s heartbeat each other to spot an unresponsive node & eventually expel it from the cluster When the VIOS returns it needs to catch up on SSP config and LU meta data, so its information is current In the past: If a user changes the time/date/zone it looks like a massive time jump = data is very out of date & forces an expel & rejoin You had to know to offline the VIOS & client LU s using: clstartstop -stop ; change date+time; clstartstop - start Once at VIOS st service pack you can change the date time at any time

29 4) lu -list -attr provisioned=<true/false> 29 If you say mapped when you read the word provisioned you can work out what this does! $ lu -list -attr provisioned=false Not mapped to any VM POOL_NAME: spiral TIER_NAME: SYSTEM LU_NAME SIZE(MB) UNUSED(MB) UDID test c043c90a91d434178a test efe7e54f79af7af67 test b cebd7357bd658 $ lu -list -attr provisioned=true is mapped to a VM POOL_NAME: spiral TIER_NAME: SYSTEM LU_NAME SIZE(MB) UNUSED(MB) UDID test de85f8af711f93a7a288 test ec547808deeba80398 $ Unfortunately, it does not say where test3 or test 5 are mounted later nmap

30 5) HMC SSP on the new Enhanced+ User GUI 30 DEMO

31 5) HMC SSP on the new Enhanced+ User GUI 31

32 6) HMC REST API for SSP performance stats 32 Is you SSP used lightly, moderate or hammered? Difficult to overview SSP I/O stats nmon from 24 VIOSs = hard work to merge! Same LUN has different hdisknn on each VIOS VIOS might be doing non-ssp disk I/O DEMO

33 6) HMC REST API for SSP performance stats HMC POWER8 VIOS Sysadmin home Server Linux or AIX & python v3 HMC interactions via REST API 1. Logon put 2. Preferences get XML 3. Switch on stats post XML 4. Request filenames get XML 5. Request files get XML 6. Files in JSON (50MB!) 7. Reformat into webpage Googlechart.html/Javascript

34 6) HMC REST API for SSP performance stats 34 POWER8 VIOS line Python script to handle XML and JSON 2. HMC can provide 3 data types 1. Raw painful to use (deltas / seconds) 2. Processes last 2+ hours every 5 minutes 3. Aggregated: min, max, averages for different capture rates Also can limit by date/time or row count 3. JSON include five levels of detail: Whole SSP VIOS node Tier Failgrp Individual disks 4. Stats size+free, read + write: IOPS, KB/s, service-times, error, timeouts 5. Outputs CSV file the processed but simple Ksh to generate the graph webpage.

35 6) HMC REST API for SSP performance stats 35

36 6) HMC REST API for SSP VIOS level stats 36

37 Are you interested in trying this 37 I am willing to help you (if I get sample data) AIXpert Blog entry _Storage_Pool_I_O_Graphs_via_the_HMC_REST_API Short Term Issues: Blog not finished yet = just a few hints and graphs. Plan to finish this tomorrow or Monday 27 th Feb 2017 But there are a few teething problems at the moment! Some of the numbers are not right SSP Developers are working on this & hopefully resolved in the next few days/weeks. When the fixes are available, I will add the details to the Blog.

38 Five New Useful SSP commands from Nigel 38

39 New SSP commands from Nigel 39 ncluster status of all VIOS nlu improved lu replacement npool storage pool use nmap finds if a lu is online (mapped) on any VIOS nslim copy a fat LU backup to a now THIN LU Hands-up how many of you have read this AIXpert Blog Shared Storage Pools Hands-On Fun with Virtual Disks (LU) by Example Storage_Pools_Hands_On_Fun_with_Virtual_Disks_LU_by_Example DEMO

40 ncluster Check the good status of all VIOS? 40 $ ncluster No State Repos Pool Role ---Upgrade-Status--- Node-Name 1 OK OK OK DBN ON_LEVEL bronzevios1.ibm.com 2 OK OK OK ON_LEVEL silvervios1.ibm.com 3 OK OK OK ON_LEVEL goldvios1.ibm.com 4 OK OK OK ON_LEVEL orangevios1.ibm.com 5 OK OK OK ON_LEVEL redvios1.ibm.com Can take 10 seconds run Ksh, 2 lines based on: cluster -status -verbose UP_LEVEL means not yet all VOIS s on higher ioslevel DBN= database node the one that writes to the repository

41 nlu - improved lu replacement, format, ordered 41 $ nlu SizeMB UsedMB Used% Type Tier Name % THIN SYSTEM AIX735_b % THICK SYSTEM JUNK % THIN SYSTEM blue_backupvg % THIN SYSTEM blue_rootvg % THIN SYSTEM blue_scratchvg % THIN SYSTEM blue_webvg % THIN SYSTEM emerald % THIN SYSTEM emerald % THICK SYSTEM orange5a % THIN SYSTEM purple3boot % THIN SYSTEM purple3files % THIN SYSTEM ruby32boot % THIN SYSTEM ruby32data % THIN SYSTEM vm100 Removed hex ID numbers & mixed in snapshots You can re-order by column name

42 nlu - improved lu replacement, format, ordered $ nlu usedmb SizeMB UsedMB Used% Type Tier Name % THIN SYSTEM vm % THIN SYSTEM vm91_mirror % THIN SYSTEM vm61c % THIN SYSTEM vm % THIN SYSTEM vm61a % THIN SYSTEM AIX735_b % THIN SYSTEM emerald % THIN SYSTEM vm18boot % THIN SYSTEM vm23a % THIN SYSTEM vm24a % THIN SYSTEM purple3boot % THIN SYSTEM ruby32boot % THIN SYSTEM vm27b % THIN SYSTEM vm21a lines of ksh, based on lu -list field nlu like lu and reorder on a column nlu [-sizemb -usedmb -used -type -tier -name (default)]

43 nmap - Is a LU mapped to a vhost somewhere 43 Ksh, 30 lines uses clcmd to run lsmap cluster wide $ nmap -h Nigel's nmap to find if a LU (virtual disk) is mapped anywhere on the SSP to a LPAR/VM nmap lu-name nmap ALL $ nmap vm21 Seach the SSP for vm21 NODE diamondvios2.aixncc.uk.ibm.com NODE diamondvios1.aixncc.uk.ibm.com NODE greenvios2.aixncc.uk.ibm.com NODE greenvios1.aixncc.uk.ibm.com NODE limevios2.aixncc.uk.ibm.com vhost6:u a v-v4-c8:vm21a.5cc155a78dbc3d1b a70ec0788 NODE limevios1.aixncc.uk.ibm.com vhost7:u a v-v1-c6:vm21a.5cc155a78dbc3d1b a70ec0788 NODE purplevio2.aixncc.uk.ibm.com NODE purplevio1.aixncc.uk.ibm.com NODE rubyvios2.aixncc.uk.ibm.com NODE emeraldvios2.aixncc.uk.ibm.com NODE emeraldvios1.aixncc.uk.ibm.com NODE rubyvios1.aixncc.uk.ibm.com NODE indigovios1.aixncc.uk.ibm.com

44 npool - storage pool use $ npool name = globular Pool Pacific Pool-Size= MB Pool-Used= MB =64.94% Pool-Free= MB =35.06% 44 Allocated to client VMs = MB Allocated compared to Pool=117.46% Used to Allocate Ratio =55.29% Overcommit= MB Ksh, 9 lines, using cluster & lssp No ntier command better to use: tier -list -verbose

45 Let talk about Sparse Files 45 Hands up who knows about then? Open a file A, write 4K, lseek() to 500 KB, write 4k, close it Then how big is the file A? Zero all through here 500 KB 4KB Answers: 500 KB +4 KB = 504 KB 4 KB + 4 KB = 8 KB Make a copy: cp A B How big is file B? Answers: 500 KB +4 KB = 504KB 4 KB + 4 KB = 8 KB 4KB SSP Thick provisioned LU is a full fat file = every block allocated SSP Thin provisioned LU is a sparse file but at a 1 MB chunk size

46 nslim - copy a fat LU backup to a now THIN LU 46 C code, 96 lines #./nslim -h Usage:./nslim (v3) is a filter style program using stdin & stdout It will thinly write a file (only copy non-zero blocks) It uses 1MB blocks If a block is zero-filled then it is skipped using lseek() If a block has data then it will write() the block unchanged Example:./nslim <AIX.lu >SSP-LU-name Flags: -v for verbose output for every block you get a W=write or.=lseek on stderr./nslim -v <AIX.lu >SSP-LU-name this gives you visual feedback on progress -t like verbose but does NOT actually write anything to stdout this lets you passively see the mix of used and unused blocks./nslim -t <AIX.lu -h or -? outputs this helpful message! Warning: Get the redirection wrong and you will destroy your LU data

47 nslim - copy a fat LU backup to a now THIN LU Examples 47 # nslim -v <$SSP/VOL1/old99.* >$SSP/VOL1/new42.* #./nslim -t <$SSP/VOL1/new77.* Processing W......W...WWWWWWWWW...W WWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWW.WWWWWWWWWWW...WWWWWWWWW...WWWWWWWWWW...WW..WWWWWWWWWWWWWWWWWWWWWWWW WWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWW.

48 nslim v4 outputs 1 line per GB 48 # /home/padmin/nslim_v4 -V <TEMP32G.6bfd6b0dd9c975c8cae0f69bf >vm99.32bcf97e86fad24f9dca0400cebe06d3 Counting 1 Written= 980 Skipped= 44 2 Written= 989 Skipped= 35 3 Written= 407 Skipped= Written= 4 Skipped= Written= 881 Skipped= Written= 393 Skipped= Written= 106 Skipped= Written= 0 Skipped= Written= 87 Skipped= Written= 0 Skipped= Written= 149 Skipped= Written= 0 Skipped= Written= 248 Skipped= Written= 0 Skipped= Written= 102 Skipped= Written= 0 Skipped= Written= 279 Skipped= Written= 0 Skipped= Written= 98 Skipped= Written= 0 Skipped= Written= 216 Skipped= Written= 0 Skipped= Written= 7 Skipped= Written= 1 Skipped=1023 Percent Written=20.27% Skipped=79.73% Done

49 49 Under the covers Shhh! This is bit is secret! Loads more info in the AIXpert blog

50 What is that VIOS filesystem about? 50 $ df Filesystem 512-blocks Free %Used Iused %Iused Mounted on /dev/hd % % / /dev/hd % % /usr /dev/hd9var % % /var /dev/hd % 119 1% /tmp /dev/vmlibrary % 6 1% /var/vio/vmlibrary /dev/hd % 93 1% /home /dev/hd11admin % 5 1% /admin /proc /proc /dev/hd10opt % % /opt /dev/livedump % 4 1% /var/adm/ras/livedump /ahafs % /aha /var/vio/ssp/spiral/d_e_f_a_u_l_t_ % - - Never ever create a file in /var/vio/ssp/ Treat it like /dev!!!

51 Backup LU from VIOS 51 $ df Filesystem 512-blocks Free %Used Iused %Iused Mounted on /dev/hd % % / /dev/hd % % /usr /dev/hd9var % % /var /dev/hd % 386 1% /tmp /dev/hd % % /home /dev/hd11admin % 5 1% /admin /proc /proc /dev/hd10opt % % /opt /dev/livedump % 4 1% /var/adm/ras/livedump /dev/vmlibrary % 8 1% /var/vio/vmlibrary /dev/fslv % 7 1% /scratch /ahafs % /aha /var/vio/ssp/stellar/d_e_f_a_u_l_t_ % - - /var/vio/ssp/stellar/d_e_f_a_u_l_t_ # cd /var/vio/ssp/stellar/d_e_f_a_u_l_t_ # ls -l total 24 drwxr-xr-x 2 root system 4096 Aug 21 13:43 IM drwxr-xr-x 7 root system 512 Jun 06 21:47 VIOSCFG drwxr-xr-x 2 root system 8192 Oct 03 17:14 VOL1 # PowerVC Deploy Images Dragons! LUfile s & hidden snapshots

52 # ls s /var/vio/ssp/stellar/d_e_f_a_u_l_t_061310/vol1 total bronze2a.9e2d5cb119e0ee278be433fc39072e64 4.bronze3a fbcfb2148a08869a bronze4a dd6f bbfabc497b104 4.bronze5a.f98b27fc9f947484ff4a66757e764f28 4.bronze6a.1488d ed51495e3c70bcc6ef57 4.fred.63a f9f7ffdd851041f4bd1af 4.volume-ScratchDisk.2c4bfdae192bdecb196399a0e9688c24 4.volume-boot-8203E4A_10E0A11-vm613cb6f0e0df0841ecbfaff86f2cc385f volume-boot-8203E4A_10E0A11-vm63a44d94e4e1034b45b1da9c75056c6bd volume-boot-8203E4A_10E0A11-vm8560dc473b76fd42a78fe26fb2c6a02e volume-boot-8203E4A_10E0A31-VM64e7f5cbaeb b2ff690daf6c806a... 4.volume-boot-8203E4A_10E0A31-vm f28a3463cb124678d0640ae5a... 4.volume-boot-8203E4A_10E0A31-vm82a64fc3ca9a91492b8a000c27d20c5b volume-vm63_backup.b c0ec90529c58bc930460d50e bronze2a.9e2d5cb119e0ee278be433fc39072e bronze3a fbcfb2148a08869a bronze4a dd6f bbfabc497b bronze5a.f98b27fc9f947484ff4a66757e764f bronze6a.1488d ed51495e3c70bcc6ef57 0 fred.63a f9f7ffdd851041f4bd1af 0 volume-scratchdisk.2c4bfdae192bdecb196399a0e9688c24 Start with. = Meta data Never ever touch these! Regular LU names volume-boot-8203e4a_10e0a11-vm613cb6f0e0df0841ecbfaff86f2cc385f volume-boot-8203e4a_10e0a11-vm63a44d94e4e1034b45b1da9c75056c6bd volume-boot-8203e4a_10e0a11-vm8560dc473b76fd42a78fe26fb2c6a02e volume-boot-8203e4a_10e0a31-vm64e7f5cbaeb b2ff690daf6c806a volume-boot-8203e4a_10e0a31-vm f28a3463cb124678d0640ae5a volume-boot-8203e4a_10e0a31-vm82a64fc3ca9a91492b8a000c27d20c5b volume-vm63_backup.b c0ec90529c58bc930460d50e 52 PowerVC horrid LU names! Raw LU files some Thin and some Thick Provisioned

53 Nine useful internal SSP operations 53 1) Rename a Thick Provisioned LU Stop the VM then lu -create to make new LU virtual disk with the new name dd if=oldlufile of=newlufile bs=1m lu -unmap the old LU then lu -map the new LU and restart 2) Rename a Thin Provisioned LU Stop the VM then lu -create to make new LU virtual disk with the new name nslim <oldlufile >newlufile lu -unmap the old LU then lu -map the new LU and restart 3) Backup a virtual disk LU Stop the VM dd if=lufile of=/tmp/mylu bs=1m Restart the VM LUfile is the file from = /var/vio/ssp/sspname/d_e_f_a_u_l_t_061310/vol1

54 Nine useful internal SSP operations 4) Recover a previous Thick Provisioned Backup Stop the VM dd if=/tmp/mylu of=lufile bs=1m Restart the VM 54 5) Recover a previous Thin Provisioned Backup Stop the VM lu -unmap -lu LUname lu -remove -lu Luname lu -create -lu newlu nslim </tmp/lubackup >newlu Restart the VM 6) Live Backup a point in time safe LU using a SSP snapshot -create -lu Luname File hidden from ls output dd if=luname@snapshotname of=/temp/backup snapshot -delete LUfile is the file from = /var/vio/ssp/sspname/d_e_f_a_u_l_t_061310/vol1 DEMO

55 Nine useful internal SSP operations 55 7) Have a look at the 1MB blocks in use within a Thin Provisioned LU nslim -t <LUfile 8) Slimming down a Thin Provisioned LU that got too Thick (AIX only) Reduce the file-systems to minimum size: chfs -a size=-1g /home (run many times) Create new max size LV dd if=/dev/zero of=/dev/lv bs=1m Remove the LV Stop the VM dd if=lufile of=/tmp/mylu bs=1m nslim </tmp/mylu >LUfile Restart VM and remove the /tmp/mylu 9) To move a Thin Provisioned LU from a remote SSP LU to a local SSP scp root@redvios1:$sspremote/vol1/lufile $SSPlocal/VOL1/LUfile LUfile is the file from = /var/vio/ssp/sspname/d_e_f_a_u_l_t_061310/vol1

56 Are you keeping up to date? 56 mr_nmon on twitter Only used to POWER / AIX technical content, hints, tips and links 150 techie hands-on videos on YouTube at AIXpert Blog Lots of mini articles & thoughts Also: