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Best Raid1 configuration for ESXi System

I have a server i'm converting from RAID5 into RAID1 for performance benefits.

The RAID card is an Intel SRCSASLS4L (HW Raid) and I have connected 3x SAS 10,000K drives.

I'll be running 2 in RAID1 and another as a JBOD for nonessential VM's.

The configuration questions I'm after are: (left is default)

Strip Size: 64k - 1024K
Read Policy: Normal, Adaptive, Ahead
Write Policy: WThru, WBack
WrThru for BAD BBU (ticked?)
IO Policy: Direct, Cached
Disk Change Policy: No Change, Enable, Disable
Disable BGI: No, Yes
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lemonville
Asked:
lemonville
1 Solution
 
Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
Are you experiencing performance problems at present?
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
How many VMs, what type of VMs, what is the Host, Host Memory, CPU etc?
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lemonvilleAuthor Commented:
In Raid5. Yes.
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lemonvilleAuthor Commented:
15 or so VM's. Linux and Windows. Running web servers (Linux & Windows) and various other items.

Host is a Dual Intel Xeon Quad Core with 16GB Ram.
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
So you are experiencing performance issues?

It's a little vague the information about VMs, but I would have thought, RAID5 with 3 x SAS 10k, you would have been okay.

But if you've been having issues, try RAID 1. I'm not personally familiar with this controller, Intel are not really know for their Raid Controllers. But I'm sure one of the storage Experts, will be able to advise about the specific settings.

What's the server?
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sharkbot221984Commented:
If you've got room in your box for one more drive, it appears your card will support RAID10.   Although you'd lose that JBOD storage, but I'd take RAID10 over RAID1 for sure.
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lemonvilleAuthor Commented:
@sharkbot

Unfortunately not enough room.
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bgoeringCommented:
Strip Size: 64k - 1024K - 256k
Read Policy: Normal, Adaptive, Ahead - Adaptive
Write Policy: WThru, WBack - Write Back
WrThru for BAD BBU (ticked?) - yes ticked
IO Policy: Direct, Cached - direct (guessing this is read policy)
Disk Change Policy: No Change, Enable, Disable - Assume this is Cache not Change policy - disabled
Disable BGI: No, Yes - Yes - just do full initialize before using it

More Info: ftp://download.intel.com/support/motherboards/server/sb/configuring_raid_for_optimal_perfromance_11.pdf

Good Luck
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lemonvilleAuthor Commented:
Great, thanks for your assistance.

Cheers
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