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April 25th, 2017 16:00
Creating VNX Pool Best Practice for RecoverPoint
I am about to create a VNX 8000 resource pool for RecoverPoint journal volumes and repository volume.
What is the recommended best practice for pool tiers when creating a VNX pool for RecoverPoint journal volumes and repository volume?
1). Single Tier: Capacity NL-SAS tier: 6+2 or 8+2 RAID 6
Or
2). Two Tiers: Performance SAS tier: 4+1 or 8+1 RAID 5 and Capacity NL-SAS tier: 6+2 or 8+2 RAID 6
If two tiers are recommended, what is the percentage for each tier?
And finally, is there a best practices document for this subject?
Thank you.
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forshr
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April 26th, 2017 06:00
In addition to Ankur's comments, ideally the pool should be sized for performance and the required PiT history requirement. Using NL-SAS drives usually translates to a requirement for more drives. Similarly, so does the use of RAID 6. On this basis, as a compromise between cost and performance, we usually recommend 10 or 15K RAID 5 4+1 in a single homogenous pool as opposed to RAID 1/0 or RAID 6.
Note that although RP applies some optimization where writes are concerned to the journal (accumulated large writes), the journal distribution is dependent on the overall MB/s performance (bandwidth).
Regards,
Rich
ankur.patel
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April 26th, 2017 04:00
Its not advised to put journals on NL-SAS disk. The image access process may be slow. Also for every 1 IO at the source there are 3 IOs at the target . The journals as are very write intensive. There isn't much IO to the repository.
https://support.emc.com/docu10385_RecoverPoint_Provisioning_and_Sizing_Technical_Notes.pdf?language=en_US