Sunday, April 28, 2019

ssd - Trim support in Hardware RAID (Perc H700)



We are about to order a dell R610 with a H700. We were thinking of using 2 X Samsung 850 Pro 512Gb drives in RAID 1.



The question is does the Perc H700 support TRIM in hardware RAID 1? The answers I have found from googling around seem to indicate no, but this also seems to be a fast moving field, and there have been firmware updates since then.




Ohh and it seems non-dell certified drives will no longer be blocked



Or, if there is no hardware supported TRIM for RAID 1 on the H700 with the latest firmware, then would it be better to get SSD's which have inbuilt TRIM based on sandforce controllers? Eg the Kingston HyperX which seems to have done reasonably well in the endurance tests



The Samsung 850's have better stats than the HyperX drives, but I am lead to believe would have degraded performance without TRIM commands being issued to them...



Thus does the PERC H700 support TRIM, if not then is there another Hardware RAID controller that does, if not is the best bet using sandforce controlled SSDs?



Thanks,
Jas



Answer



Well, doesn't the SSD choice depend a bit on your anticipated workload?



Really: Are SSD drives as reliable as mechanical drives (2013)?



But generically, you can attach just about anything to an LSI (Perc) controller and make it work. Should you? I mean, these are still consumer disks...



There's no TRIM support on the hardware RAID controller (it's not common). It's also not that important. You can just under-provision the drives. Create a Virtual Disk smaller than the capacity of the SSDs; e.g. don't allocation all of the space to the disks.



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