3 Dell Equallogic PS6010

Hello

I have 3 Dell Equallogic PS6010 Raid 6 accelerated what is the optimal configuration for performance and reliability. Should I put all members in the same pool with some volumes? using this configuration what happens if one of the members die in the pool volumes will still be online? Or do I have to create a separate pool for each Member and syncrep everywhere?

Thank you!

Hello Quackattack,

If you have several members in the same pool, then default data for each volume to be spread out in the members.  Up to three by default, unless the volume is too large to fit on only three members.

So in the case of Member failure, all volumes in common with this member will go offline until the table is restored to service.  Members in the same pool work together so that will give you the best performance, but at a greater risk.  The berries are extremely redundant to prevent this.  Also, members in a pool even with permutation of the blocks to keep the I/O latency to the balance between the members.  If a member with a lot of IO will send blocks occupied another Member and take blocks of slow motion of this member.  Keeping the latency in space and tick as well balanced.   It's advanced performance load balancing.

But if this is a priority, then put them in separate categories would be better.  You would have to manually manage IO loads to prevent a pool being saturated, while others might be slowed by comparison.

You can also do a combo.  Put two members in a pool, then someone else in another to the syncrep on your volumes. Giving you a balance between too.

Much depends on the load that you expect to apply to the group.  In addition, if you can levarge improvements EQL MPIO, like MEM for ESXi, HIT / THE for Linux or HIT / ME to Windows.

If you use ESXi, VMware requires also to company or company + to run MPIO extensions like MEM.  If you cannot use MEM, then this PDF has info on how to improve fuction MPIO using VMware standard Round Robin.  As well as other tips as well.

en.Community.Dell.com/.../20434601

If you haven't already done so, install SANHQ v3.x to better monitor your group (s).

Kind regards

Tags: Dell Products

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