Performance problems

Question

We have RAID6 6+2 Raid group that is getting hit pretty hard with I/O from ESX hosts. The customer is identifying hard hitting VM's and is planning to move them off to fiber channel mounts. I have spare FC disks that are available to me I was wondering if should do a LUN migration of the SATA drives, for the short term, to alleviate performance problems. Problem is I dont know what this will do to a celerra? Should I LUN migrate to other Raid6 Sata Drives instead? Is there a celerra tool I can use to perform the same type of migration without impact to my customer?

I am very competant on the Clariion side but this is my first time with a Celerra...be gentle!

Thanks,

Mike

nandas · Answer

Hi Mike,LUN migration is not supported with Celerra. So, you 'll not be able to do so.What version of NAS code are you running? Is this an Integrated (Non-FC) or Gateway/FC-enabled box?You may create a supported RAID configuration on the FC Disks - say 4+1 RAID 5 or so and bind the LUNs following guidelines. If this is an integrated (non-FC) box, you may run the setup_clariion -init script to configure these disks if not already configured.Then create file system on the FC disks and use Celerra Replicator to migrate from the existing file systems on SATA drives to the new file system on FC disks.However, I 'll suggest to open a Service Request first with EMC support to check this issue before proceeding further.Thanks,Sandip

dynamox · Answer

Hey Mike,you can not use Lun migrator on LUNs presented to Celerra. Do you have storage vmotion to move VMs to LUNs in fibre channel pool on Celerra ?

mpalumbo1 · Answer

Dynamox,I have made that recommendation to the ESX administrator. I was more curious at to my options on the Storage side. What can I do to help him?Thanks,Mike

dynamox · Answer

if you are using NFS as your vmfs stores ..you could use fs_copy to move the data between the pools/file systems.

mpalumbo1 · Answer

Well the final resolution was identifying Hosts that were the hardest hitting and taking down time for those specific hosts and then moving them to FC. Thanks guys for the Input.Mike

Celerra

Performance problems

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