On Sat, 14 Jul 2007, Bill Davidsen wrote:
Justin Piszcz wrote:
On Sat, 14 Jul 2007, Bill Davidsen wrote:
Bryan Christ wrote:
My apologies if this is not the right place to ask this question.
Hopefully it is.
I created a RAID5 array with:
mdadm --create /dev/md0 --level=5 --raid-devices=5 /dev/sda1 /dev/sdb1
/dev/sdc1 /dev/sdd1 /dev/sde1
mdadm -D /dev/md0 verifies the devices has a persistent super-block, but
upon reboot, /dev/md0 does not get automatically assembled (an hence is
not a installable/bootable device).
I have created several raid1 arrays and one raid5 array this way and have
never had this problem. In all fairness, this is the first time I have
used mdadm for the job. Usually, I boot to something like SysRescueCD,
used raidtools to create my array and then reboot with my Slackware
install CD.
Anyone know why this might be happening?
Old type arrays are assembled due to having the proper partition type,
0xfd "Linux auto RAID" and are assembled by the kernel. All others are
assembled by mdadm running out of initrd or similar, and failures there
result from not having a proper config file in the initrd image.
IIRC raidtools does set the array partitions to the auto-assemble
partition type. Hope that points you in the right direction. Running
"fdisk -l"
as root will let you see all the partitions, types, etc, for everything on
your system.
I may be wrong, I thought auto-assemble only worked with type 0 or 1.
--
bill davidsen <davidsen@xxxxxxx>
CTO TMR Associates, Inc
Doing interesting things with small computers since 1979
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I use auto-assemble (in conjunction with Debian's own startup scripts) and
for my root RAID1 device,swap and /boot, it is automatically taken care of
by the kernel. For RAID5, it seems to work the same:
Are those partitions type "Linux RAID" or is the assemble being run from the
init scripts? I suspect the latter.
[ 58.919378] RAID5 conf printout:
[ 58.919418] --- rd:10 wd:10
[ 58.919457] disk 0, o:1, dev:sdc1
[ 58.919498] disk 1, o:1, dev:sdd1
[ 58.919539] disk 2, o:1, dev:sde1
[ 58.919579] disk 3, o:1, dev:sdf1
[ 58.919619] disk 4, o:1, dev:sdg1
[ 58.919659] disk 5, o:1, dev:sdh1
[ 58.919719] disk 6, o:1, dev:sdi1
[ 58.919759] disk 7, o:1, dev:sdj1
[ 58.919799] disk 8, o:1, dev:sdk1
[ 58.919839] disk 9, o:1, dev:sdl1
Justin.
The partitions are 0xfd: Auto-detect:
/dev/sdc1 1 18241 146520801 fd Linux raid autodetect
/dev/sdd1 1 18241 146520801 fd Linux raid autodetect
/dev/sde1 1 18241 146520801 fd Linux raid autodetect
/dev/sdf1 1 18241 146520801 fd Linux raid autodetect
/dev/sdg1 1 18241 146520801 fd Linux raid autodetect
/dev/sdh1 1 18241 146520801 fd Linux raid autodetect
/dev/sdi1 1 18241 146520801 fd Linux raid autodetect
/dev/sdj1 1 18241 146520801 fd Linux raid autodetect
/dev/sdk1 1 18241 146520801 fd Linux raid autodetect
/dev/sdl1 1 18241 146520801 fd Linux raid autodetect
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