SSD Drives in a Raid5 Configuration

I am rebuilding some Dell R610 Servers and would like to go back in with 6x480GB SanDisk Ultra II SSD Drives.

Any suggestions?

Has anyone experience any negative results from this?

Will the R610 disk controller bottle neck and cause errors due to the I/O rates of the SSD Raid5 Array?
armgonAsked:
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andreasSystem AdminCommented:
You can read this as a first orientation

http://www.tomshardware.com/reviews/ssd-raid-benchmark,3485-13.html

You may not get the performance kick you are expecting. This is due to some reasons.

1. Raid5 is always slow on writes as the parity needs to be calculated by the controller, even on spinning disks its the bottle neck.
2. no Trim support, the SSDs once one time filled up, need to copy-write idle blocks on each write operation as the disk is not aware of which blocks are unused, only the OS will keep track on filesystem level, but the Disks are not aware of this and consider all blocks written once as full and in use, once a file is saved (even only one block long) a whole row of nand cells needs to be read and written again (this also makes your SSD age faster on a raid than in normal operation).

In reading you will get much better performance than on one single SSD especialy when reading larger files. Keep in mind that every read on a windows system also will cause a write (updating the metadata of that file, e.g. date of last access)
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
I would not use RAID 5 for any disk configuration.

Also you will not get the performance you are looking for, many have tried here on EE, with VMware, and are surprised by how slow, combining SSDs in RAID is!
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armgonAuthor Commented:
Good feedback from everyone.

In your opinions what would be the best configuration for these R610 servers?

Are spinning drives totally out of the question? Is a combination the answer?

I am loading VMware on SD cards. The drives are going to house VMs of all sorts. For sure of the the VM will be running MSSQL Server.

I am looking for performance and a little redundancy.

By the way I have 2 R610 which I want to build identical as 2 host (cannot afford SAN for this project) but would like to have a second host inhouse (to be able to fall back on something). Plan to run both at 50% of storage capacity in the event we need to move to just one host in a hurry.
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
15K SAS disks in RAID 10.
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