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Migrating MetaLUN components
Clariion CX3-40 running Flare 26. I want to rearrange some of the RAID Groups to suit a better layout and get RG across different backend Bus. Of the RAID Groups in Question I need to move the Component 0 LUN of a MetaLUN from one RAID Group to another. I have in the past migrated Whole LUNs from RG to RG but not sure about a LUN that forms a component of a MetaLUN. Performance will slow - I appreciate this but small pain for long term gain.
Any Gotcha's about moving Component LUNs?
dynamox
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April 8th, 2010 20:00
You can't migrate private LUNs ..which are component LUNs in your MetaLUN
dynamox
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April 8th, 2010 21:00
that should work, as you build your MetaLUN make sure to select correct MetaLUN stripe multiplier, for R5 4+1 it's 4 ( i believe it's the default value). I use "EMC Clariion Best Practices for Performance and Availability" as my Clariion bible
Sparkles1
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April 8th, 2010 21:00
Therefore...
option A: is to create a standard LUN on some SATA of the same size as the MetaLUN; Migrate from the Meta to the Standard; then recreate the metaLUN on the new RAID Group and migrate back?
Reason: I have three RG of 300Gb FC all on the same BUS but across two DAE's used for Backups. These are currently RAID 10.
RG6 = 1_1_0 > 1_1_4 + 1_1_10 > 1_1_14 (10 disks)
RG7 = 1_1_5 > 1_1_9 + 1_3_10 > 1_3_14 (10 disks)
RG14 = 1_3_0 >1_3_9 (10 disks)
Two further RG on another DAE
RG8 = 0_2_0 > 0_2_6, (7 disk)
RG9 = 0_2_7 > 0_2_14, (8 disk)
I can temporarily free up 1x DAE (1_1_0 > 1_1_14) and hoped to migrate RG8 & 9 effectivcely on to these disks.
The create three 4+1 RG on 0_2 plus three 4+1 RG on 1_3 and create metaLUNs for backup. Giving me access to both Buses for the backup.
Note: I inherited this setup from previous Admin. and this is a small step in a bigger picture to try and sort out the array. All live and no sandpit.
kelleg
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April 9th, 2010 09:00
Also see the just released document EMC CLARiiON MetaLUNs: A Detailed Review 2.0
http://powerlink.emc.com/km/live1/en_US/Offering_Technical/White_Paper/H1024.1_clariion_metaluns_cncpt_wp_ldv.pdf
There is a lot of really good information about metaLUNs contained in this new White Paper
glen