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Hello,
Our current setup is as follows:
VNX5100
1 x DPE (15 sas drives - 4 for OS)
1 x DAE (15 sas drives)
1 x DAE (2 sas drives)
We are using the array for a VMware server farm and was wondering what a recommended configuration could be to minimize downtime in case of a lost DAE:
For example moving the disks:
dpe - 10 disks
dae - 9 disks
dae - 9 disks
Then create some RAID groups that use disks from each tray????? I know by default the RAID groups take the disks from the same tray.
Thanks
take a look at these two papers, they might give you some ideas
White Paper: EMC Unified Storage System Fundamentals for Performance and Availability
When I was in Symmetrix support team, I saw the whole DAE failed every day for variety of reasons. Sometimes the whole bus failed which includes 2 or 3 DAEs. Because Symmetrix always keep another datacopy on other bus, customer won't experience DA. I am always wondering why CLARiiON would select drives in the same DAE to form Raid Group by default. You can follow EMC BP. But if I have a CLARiiON, I won't create Raid Group on that way.
jingyi wrote:
Keep in mind pool is also comprised of multiple Raid Groups. If you lose 2 disks in the same raid group, you will face Data Unavailable.
and if you put your raid group members in different DAEs and you have mutlipe drive failures in your RG you won't exprience DU ?
dynamox
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Posted January 15th, 2012 18:00
if you look in VNX best practices document, there is actually a section for vertical provisioning. Other then some corner cases, it's not something that you MUST do and if you use virtual pools it does not matter anymore.