Re: raid5: degraded after reboot

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Andre Noll wrote:
On 10:38, Jon Nelson wrote:
<4>md: kicking non-fresh sda4 from array!

what does that mean?

sda4 was not included because the array has been assembled previously
using only sdb4 and sdc4. So the data on sda4 is out of date.

I also have this:

raid5: raid level 5 set md0 active with 2 out of 3 devices, algorithm 2
RAID5 conf printout:
 --- rd:3 wd:2 fd:1
 disk 1, o:1, dev:sdb4
 disk 2, o:1, dev:sdc4

This looks normal. The array is up with two working disks.

Why was /dev/sda4 kicked?

Because it was non-fresh ;)

md0 : active raid5 sda4[3] sdb4[1] sdc4[2]
      613409664 blocks level 5, 64k chunk, algorithm 2 [3/2] [_UU]
      [==>..................]  recovery = 13.1% (40423368/306704832)
finish=68.8min speed=64463K/sec

Seems like your init scripts re-added sda4.

65-70KB/s is about what these drives can do so the rebuild speed is just peachy.

If the rebuild completes successfully, you're ok again.  There's
nothing you have to do.

What you didn't say is that "doing nothing" is not only all that's required, but where possible it's the best thing *to* do, avoiding any testing of the "recover while active" logic, any extra seeking, etc.

And I would be sure I understood why the system had to be force booted. If sysreq is working I would assume using 's' before 'b' is normal. 'Tis on my systems!


--
bill davidsen <davidsen@xxxxxxx>
 CTO TMR Associates, Inc
 Doing interesting things with small computers since 1979

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