Summary - SDS question.
2007-12-25 0:11:00
Jed Dobson,
Jeff Woolsley,
Julie Peers,
Ana Estuardo,
Ralf Albrecht.
With regards to resyncing the submirror, 4 out 5 respondents suggested
using metareplace
with -e option. One respondent suggested I just use metattach to resync the
device. Being
excessively timid I was not brave enough to try the second method (which I
have no doubt
would have worked) so I went with the majority and the first method which
worked
fine.
I recreated the metadb replicas as below.
Thanks again to all respondents.
Original post:
>Hi Sunmanagers,
> We experienced power fluctuations which caused a drive to
momentarily spin
>down. The drive has 5 slices 4 of which are submirrors of 4 different SDS
mirrors.
>The 5th slice contains metadb replicas.
>I am fairly confident that there is nothing wrong with the disk.
>Two of these submirrors are shown as needing maintenance and the other 2
are OK.
>Also one of the metadb replicas on this device are showing up as having
device write
>errors.
>
> flags first blk block count
> a m p luo 16 1034 /dev/dsk/c0t0d0s7
> a p luo 1050 1034 /dev/dsk/c0t0d0s7
> a p luo 2084 1034 /dev/dsk/c0t0d0s7
> a p luo 16 1034 /dev/dsk/c2t0d0s7
> a p luo 1050 1034 /dev/dsk/c2t0d0s7
> a p luo 2084 1034 /dev/dsk/c2t0d0s7
> W p l 16 1034 /dev/dsk/c7t0d0s7
> a p luo 1050 1034 /dev/dsk/c7t0d0s7
> a p luo 2084 1034 /dev/dsk/c7t0d0s7
>
>Question.
> Should I use metareplace with the -e option to transition the
submirrors needing
>attention to the available state. The man page seems to be saying that
you would use this option when
>you have had a power disturbance. Has anyone had a similar experience and
used this option?
> I guess the alternative would be to do
>metadetach->metaclear->metattach
>
>Also what steps should I take to fix the metadb replica?
>metadb -d /dev/dsk/c7t0d0s7
>followed by
>metadb -a -c 3 /dev/dsk/c7t0d0s7 ?
Tim Hespe
System Admin.
University of New South Wales Library
t.hespe at unsw.edu.au
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