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Old 07-11-2007, 07:29 AM   #1
Registered: Apr 2006
Location: Athens, Greece
Distribution: slackware, debian, ubuntu
Posts: 647

Rep: Reputation: 38
linear raid does not appear on start up.

hello everyone,
i am trying to setup a linear raid on 3 old IDE/ATA hard disks i had 'laying around'. one is 120GB and another 2 of 40GB each.

so i followed the instructions from the raid howto:

i put a new entry in /etc/raidtab file so now it looks as

nass@stargaze:~$ cat /etc/raidtab
raiddev /dev/md0
raid-level              5
nr-raid-disks           4
nr-spare-disks          0
persistent-superblock   1
parity-algorithm        left-symmetric
chunk-size              128
device                  /dev/sdb1
raid-disk               2
device                  /dev/sdc1
raid-disk               3
device                  /dev/sdd1
raid-disk               0
device                  /dev/sde1
raid-disk               1

raiddev /dev/md1
raid-level              linear
nr-raid-disks           3
persistent-superblock   1
chunk-size              128
device                  /dev/hde1
raid-disk               0
device                  /dev/hdg1
raid-disk               1
device                  /dev/hdh1
raid-disk               2
as you can see i have already a raid5 on some other drives and this raid5 works nicely during boot up.

now i set the hd[egh] type of the disks to 0xFD (linux raid autodetect) and generated a node /dev/md/1 with
mknod 1 b 9 1
and changed the attributes to be
ls -l /dev/md/1 -> 660 root disk
and finally i put a symlink of /dev/md/1 in /dev/md1

then i generated the linear raid array with mkraid /dev/md1.
at this point the array is running i verfied it with cat /proc/mdstat.

but when i reboot the /dev/md/1 node does not exist anymore, and the raid drives are not 'brought together'

root@stargaze:/dev/md# lsraid -p
[dev   9,   0] /dev/md0         A05127A7.6564DA58.72ED4934.882DCB97 online
[dev   8,  49] /dev/sdd1        A05127A7.6564DA58.72ED4934.882DCB97 good
[dev   8,  65] /dev/sde1        A05127A7.6564DA58.72ED4934.882DCB97 good
[dev   8,  17] /dev/sdb1        A05127A7.6564DA58.72ED4934.882DCB97 good
[dev   8,  33] /dev/sdc1        A05127A7.6564DA58.72ED4934.882DCB97 good

[dev  33,   1] /dev/hde1        676A8741.F692F5CE.31132577.8DAE2691 unbound
[dev  34,   1] /dev/hdg1        676A8741.F692F5CE.31132577.8DAE2691 unbound
[dev  34,  65] /dev/hdh1        676A8741.F692F5CE.31132577.8DAE2691 unbound
any idea why the raid does not start?
Old 07-11-2007, 10:12 AM   #2
Registered: Apr 2006
Location: Athens, Greece
Distribution: slackware, debian, ubuntu
Posts: 647

Original Poster
Rep: Reputation: 38
could it have something to do that these are IDE disks? could they be handled differently compared to the SATA drives?...

the thing is at startup the node /dev/md/1 does not exist.. which basically means the system has not identified these raided drives...

is there a certain step i have to take thhat i haven't considered?


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