Hi list,
the mdadm 3.2.5 assemble command doesn't scale correctly.
First, I've tested simple stuff with "strace" like this one:
# mdadm -A /dev/md0 /dev/loop0 /dev/loop1
This also scans imsm superblocks by reading files from "/sys/bus/pci".
Let's set it explicitly to 1.2:
# mdadm -A /dev/md0 -e 1.2 /dev/loop0 /dev/loop1
This results in approx. 100 lines less strace output.
But now the big performance killer:
Assemble()->open_dev_excl()->dev_open("%d:%d")->map_dev()
Why does this have to scan the whole "/dev" directory - not finding any
device with the same/wanted major:minor? Isn't there a better method?
It takes longer and longer the more devices are in /dev.
Cheers,
Sebastian
--
Sebastian Riemer
Linux Kernel Developer - Storage
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