mdstat: resync=DELAYED

Hello, All:

I'm configuring a SuperMicro 5013CM8 (with on-board Adaptec AIC-7902B U320
SCSI controller controlling two Seagate ST373207LC 73GB U320 hard-drives) and
am experiencing random crashes: The system ocassionally blurts out a bunch of
stuff about the SCSI system and then freezes.

Checking the contents of /proc/mdstat I see a potential red-flag:

%> cat /proc/mdstat
Personalities : [raid1]
read_ahead 1024 sectors
Event: 5
md2 : active raid1 sdb1[1] sda1[0]
48064 blocks [2/2] [UU]
resync=DELAYED
md0 : active raid1 sdb2[1] sda2[0]
7341632 blocks [2/2] [UU]
resync=DELAYED
md1 : active raid1 sdb3[1] sda3[0]
10482304 blocks [2/2] [UU]
resync=DELAYED
md3 : active raid1 sdb6[1] sda6[0]
1052160 blocks [2/2] [UU]
resync=DELAYED
md4 : active raid1 sdb7[1] sda7[0]
50660864 blocks [2/2] [UU]
[======>..............] resync = 30.4% (15410224/50660864)
finish=56.9min speed=10315K/sec

What does this mean? How can I fix it?

--
Eric P.,
Truckee, CA
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Re: mdstat: resync=DELAYED

Eric Pretorious wrote:
> Hello, All:
>
> I'm configuring a SuperMicro 5013CM8 (with on-board Adaptec AIC-7902B U320
> SCSI controller controlling two Seagate ST373207LC 73GB U320 hard-drives) and
> am experiencing random crashes: The system ocassionally blurts out a bunch of
> stuff about the SCSI system and then freezes.

> md3 : active raid1 sdb6[1] sda6[0]
> 1052160 blocks [2/2] [UU]
> resync=DELAYED
> md4 : active raid1 sdb7[1] sda7[0]
> 50660864 blocks [2/2] [UU]
> [======>..............] resync = 30.4% (15410224/50660864)
> finish=56.9min speed=10315K/sec
>
> What does this mean? How can I fix it?
>

That in itself is not a problem.
The raid subsystem is not going to resync more than one array at a time here, or else your drive
heads would thrash themselves silly. It will progress its way up the list as each resync completes.

A dead restart on my old server used to do exactly the same thing.
As for your SCSI problems, I'm afraid I can't help.

Regards,
Brad
--
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to learn from the experience of others, are also remarkable
for their apparent disinclination to do so." -- Douglas Adams
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