jgreco
Resident Grinch
- Joined
- May 29, 2011
- Messages
- 18,680
SSDs alleviate that issue by removing the 3+ms seek time of hard drives in favor of microsecond seek times.
in the most optimistic cases. in the average case, somewhat less, and for writes, varies widely.
I wouldn't run SSDs in a RAID-1 without a backup since you'd literally be doing 1:1 writes to both drives. In theory, both drives would reach end of life at roughly the same time. What you could do is a RAID1 of 2 SSDs with a nightly backup to a regular platter based hard drive.
which is why you acquire ssds from two different vendors with hopefully two different technologies. that's actually what we're doing for primary direct-attached ESXi datastores these days, complete with frequent backups, hoping to do the same with a bunch of secondary storage on some FreeNAS storage soon as prices continue to fall, 9.1 comes out, and I actually look at whether or not TRIM and ZFS can be made to work together on 9.1 or whatever.