On Fri, Sep 20, 2013 at 6:20 AM, Tanstaafl <tansta...@libertytrek.org> wrote: > Hi all, > > Being that one of the big reasons I stopped using RAID5/6 was the rebuild > times - can be DAYS for a large array - I am very curious if anyone has > done, or knows of anyone who has done any tests comparing rebuild times when > using slow SATA, faster SAS and fastest SSD drives. > > Of course, this question is moot if using ZFS RAID, but not every situation > or circumstance will allow it...
I don't have an all-out comparison, but at least a data point for you with somewhat cheap and recent hardware. I have a new (2 months old) home RAID6 made out of: 6 Western Digital Red 3TB SATA drives LSI 9200-8e SAS JBOD controller Sans Digital TR8X+B SAS/SATA enclosure w/ SFF-8088 cables I created a standard linux software RAID6 using mdadm, resulting in 11TB of usable space (4 data drives, 2 parity). A couple weeks ago one of the drives died. I hot-swap replaced it with a new one (with no down-time) and the rebuild took exactly 10 hours. Under normal operation, the speed of the array for contiguous read/writes is about 600MB/sec, which is faster than my SSD (single drive, not RAIDed). FWIW
