[SATLUG] Software RAID suggestions

FIRESTORM_v1 firestorm.v1 at gmail.com
Fri Feb 26 13:39:04 CST 2010

An update:

Ok, so I've lucked out and it looks like the RAID card jumps into JBOD
mode when there is no array defined. Thankfully this means I don't
have to fudge with drivers, it "just works" in Ubuntu Jaunty.

It's been ages since I've done this, and I took a look at /proc/mdstat
after I started building the new array.  Here's what it shows:

Personalities : [linear] [multipath] [raid0] [raid1] [raid6] [raid5]
[raid4] [raid10]
md0 : active raid5 sde[4] sdd[2] sdc[1] sdb[0]
      2197723392 blocks level 5, 64k chunk, algorithm 2 [4/3] [UUU_]
      [>....................]  recovery =  3.3% (24638696/732574464)
finish=2483.9min speed=4747K/sec

unused devices: <none>

My only concern is that the third line [UUU_] looks a little odd.   I
expected [UUUU] since I have 4 SATA drives and I specified their
devices on the commandline:

#  mdadm --create /dev/md0 --level=5 --raid-devices=4 /dev/sdb
/dev/sdc /dev/sdd /dev/sde

I don't recall anyone specifying what the [UUU_] but can someone tell
me if I'm chasing ghosts or letting myself get too nervous?

Thank you all, your recommendations have been very helpful!


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