Hi,
I've built an 11TB RAID5 array using fedora23 (soon to be fedora24) to be used for backup for a bunch of mail and web servers, and thought I'd inquire about the best filesystem to use.
I suppose I'm most familiar with ext4, although I understand xfs is the default filesystem during install now.
I believe most files will be maildir style email files, as well as maillogs, and some tar.bz2 files, so the file size ranges will be varied.
We're using a homegrown backup script that uses rsync with the --link-dest option to preserve space. I'd like to move to bacula, but don't have the time/resources right now.
I'm concerned about recovery time for failed disks, but that's probably a conversation for another post.
I thought the info below would be helpful - /proc/mdstat and hdparm output.
md125 : active raid5 sdh1[4] sde1[0] sdf1[1] sdg1[2] 11720656896 blocks super 1.2 level 5, 512k chunk, algorithm 2 [4/4] [UUUU] bitmap: 0/30 pages [0KB], 65536KB chunk
# hdparm -i /dev/sdh
/dev/sdh:
Model=WDC WD4000FYYZ-01UL1B3, FwRev=01.01K04, SerialNo=WD-WMC130F0NJV0 Config={ HardSect NotMFM HdSw>15uSec SpinMotCtl Fixed DTR>5Mbs FmtGapReq } RawCHS=16383/16/63, TrkSize=0, SectSize=0, ECCbytes=0 BuffType=unknown, BuffSize=unknown, MaxMultSect=16, MultSect=off CurCHS=16383/16/63, CurSects=16514064, LBA=yes, LBAsects=7814037168 IORDY=on/off, tPIO={min:120,w/IORDY:120}, tDMA={min:120,rec:120}
Thanks, Alex