On Fri, 2005-11-11 at 15:25 -0800, Danny Howard wrote: > On Fri, Nov 11, 2005 at 02:25:35PM -0800, Rick Stevens wrote: > > On Fri, 2005-11-11 at 14:16 -0800, Danny Howard wrote: > > > > Sweet! I can "fail" a disk and remove it thus: > > > mdadm --fail /dev/md0 /dev/sdb1 > > > mdadm --fail /dev/md1 /dev/sdb2 > > > mdadm --fail /dev/md2 /dev/sdb3 > > > [ ... physically remove disk, system is fine ... ] > > > [ ... put the disk back in, system is fine ... ] > > > mdadm --remove /dev/md0 /dev/sdb1 > > > mdadm --add /dev/md0 /dev/sdb1 > > > mdadm --remove /dev/md1 /dev/sdb2 > > > mdadm --add /dev/md1 /dev/sdb2 > > > mdadm --remove /dev/md2 /dev/sdb3 > > > mdadm --add /dev/md2 /dev/sdb3 > > > [ ... md2 does a rebuild, but /boot and <swap> are fine -- nice! ... ] > > > > The RAID should go into degraded mode and continue to run. If you > > pulled the disk out while the system was powered up AND the system isn't > > hot swap-compatible (and most built-in SATA stuff isn't), then you've > > confused the SCSI bus badly and I'd be amazed if it worked at all after > > that. Your error messages indicate that's the case here. > > Rick, > > Given support of the OS, the drive is hot-swap. This works fine with > FreeBSD, and this works fine with Linux if I tell md that the disk is > failed. If the disk fails without me telling md, then md will react > badly. > > If, however, the SATA drives were in a hot swap-compatible enclosure and > > you see the same problem, then something else is wrong and we'd need to > > look at that a bit more closely. > > What do you suggest? Well, did you set up a program to handle failures in the /etc/mdadm.conf file? In this case, when you pull the drive, md will run the program with the three parameters "Fail", "/dev/mdx" and "/dev/sdxy". The program should then "mdadm --fail /dev/mdx /dev/sdxy". A simple script should suffice to do it. Here's a fragment to handle this sort of thing: #!/bin/bash EVENT=$1 ARRAY=$2 DEVICE=$3 case "$EVENT" in Fail) mdadm --fail $ARRAY $DEVICE ;; (etc. etc.) The actual events that mdadm will monitor are listed in mdadm's man page. ---------------------------------------------------------------------- - Rick Stevens, Senior Systems Engineer rstevens@xxxxxxxxxxxxxxx - - VitalStream, Inc. http://www.vitalstream.com - - - - NEWS FLASH! Intelligence of mankind decreasing! Details at... - - uh, when, uh, the little hand is, uh, on the... Aw, NUTS! - ----------------------------------------------------------------------
