Tim Connors <tim.w.connors@gmail.com> writes:
On Wed, 6 Aug 2014, Mike O'Connor wrote:
If there not Enterprise SAS SSD's they will have issues being in array because the firmware is not optimised fir it. The same way as standard spinning media drive has issues with being in a raid array if its not configured for it.
Never run SSD's in more than a raid mirror, unless the drive actually indicates it ok to be used in a RAID.
[Citation needed]
It's just data.
I assume he's working from the first principles that 1. the FTL will be optimized for FAT (or maybe NTFS), because that's what "normal" people put on it, and 2. a RAID5/6 workload doesn't look like a FAT workload. In the same way that in a spinning rust drive, "enterprise" or "NAS" firmwares are better because they are programmed to give up QUICKLY -- so the RAID controller can go "oh OK" and grab the block from another disk. (Also maybe they have tighter QA controls, but meh.) If it's for a super duper RDBMS cluster or something, the suboptimal performance might matter, but if it's just serving office documents then nobody is going to give a shit. Just give it a bunch more RAM so it can cache the most popular disk blocks.