RAID 10 over RAID 5 when using SSDs

Posted by root on Server Fault See other posts from Server Fault or by root
Published on 2012-11-25T01:48:20Z Indexed on 2012/11/25 5:05 UTC
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virtualization

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raid

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ssd

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sas

I am considering implementing an iSCSI shared storage array using SATA SSDs instead of the 15k RPM SAS drives we normally purchase.

We normally use RAID 10 because of spindle contention with the random IO produced by virtualized workloads.

I was wondering if we could switch to RAID 5 or RAID 6 to have more usuable space now that spindle contention is less of an issue. A question in my mind is how much overhead there is from the controller calculating parity. I am aware that this configuration will not allow TRIM to function.

Our current workloads are running on a Dell H800 with a 24 bay external enclosure.

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