Hi,
here's a somewhat funny situation:
A drive (/dev/sdb) of a RAID1 with damaged superblock is attached to a
laptop. Someone stupid attaches another drive (/dev/sdc) with a very old
backup mirror of /dev/sdb. And -
the raid starts to sync:
Jan 21 20:46:32 localhost kernel: [ 7789.680603] md: bind<sdc1>
Jan 21 20:46:32 localhost kernel: [ 7789.681358] md: bind<sdc2>
Jan 21 20:46:32 localhost kernel: [ 7789.685163] RAID1 conf printout:
Jan 21 20:46:32 localhost kernel: [ 7789.685168] --- wd:1 rd:2
Jan 21 20:46:32 localhost kernel: [ 7789.685173] disk 0, wo:1, o:1,
dev:sdc1
Jan 21 20:46:32 localhost kernel: [ 7789.685178] disk 1, wo:0, o:1,
dev:sdb1
Jan 21 20:46:32 localhost kernel: [ 7789.685387] md: recovery of RAID
array md0
Jan 21 20:46:32 localhost kernel: [ 7789.685392] md: minimum
_guaranteed_ speed: 1000 KB/sec/disk.
Jan 21 20:46:32 localhost kernel: [ 7789.685396] md: using maximum
available idle IO bandwidth (but not more than 200000 KB/sec) for recovery.
Jan 21 20:46:32 localhost kernel: [ 7789.685402] md: using 128k window,
over a total of 3903680 blocks.
Jan 21 20:46:32 localhost kernel: [ 7789.685707] RAID1 conf printout:
Jan 21 20:46:32 localhost kernel: [ 7789.685712] --- wd:1 rd:2
Jan 21 20:46:32 localhost kernel: [ 7789.685717] disk 0, wo:1, o:1,
dev:sdc2
Jan 21 20:46:32 localhost kernel: [ 7789.685721] disk 1, wo:0, o:1,
dev:sdb2
Jan 21 20:46:32 localhost kernel: [ 7789.685819] md: delaying recovery
of md1 until md0 has finished (they share one or more physical units)
Jan 21 20:50:01 localhost kernel: [ 7997.625245] md: md0: recovery done.
Jan 21 20:50:01 localhost kernel: [ 7997.723416] md: recovery of RAID
array md1
Jan 21 20:50:01 localhost kernel: [ 7997.723421] md: minimum
_guaranteed_ speed: 1000 KB/sec/disk.
Jan 21 20:50:01 localhost kernel: [ 7997.723425] md: using maximum
available idle IO bandwidth (but not more than 200000 KB/sec) for recovery.
Jan 21 20:50:01 localhost kernel: [ 7997.723432] md: using 128k window,
over a total of 191454528 blocks.
Which direction did the sync go?
Best regards,
Eddy Ilg
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