On Mon, 9 Jul 2012 16:38:47 +0200 (CEST) Jan Engelhardt <jengelh@xxxxxxx>
wrote:
>
> Using mdadm-3.2.2 from openSUSE_12.1:
>
> # modprobe brd rd_size=1 rd_nr=4096
> # mdadm -C /dev/md9 -l 10 -n 384 /dev/ram{0..383}
> mdadm: Defaulting to version 1.2 metadata
> Segmentation fault (core dumped)
>
> #1 Create (st=0xb4c600, mddev=0x7fff3bda64c0 "/dev/md9", chunk=512, level=10,
> layout=12593328, size=4, raiddisks=384, sparedisks=0,
> name=0x7fff3bda64c7 "9", homehost=0x7fff3bda6fe0 "seven", uuid=0x0,
> subdevs=384, devlist=0xb49030, runstop=0, verbose=0, force=0,
> assume_clean=0, bitmap_file=0x0, bitmap_chunk=65534, write_behind=0,
> delay=5, autof=0) at Create.c:899
> 899 fprintf(stderr,
> (gdb) l
> 894 info_new.uuid, chosen_name);
> 895 me = map_by_devnum(&map, st->container_dev);
> 896 }
> 897
> 898 if (st->ss->write_init_super(st)) {
> 899 fprintf(stderr,
> 900 Name ": Failed to write metadata to %s\n",
> 901 dv->devname);
> 902 st->ss->free_super(st);
> 903 goto abort;
> (gdb) p dv
> $1 = <optimized out>
> --
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This bug is fixed by
http://neil.brown.name/git?p=mdadm;a=commitdiff;h=401142133
It isn't specific to large numbers of devices.
If you would like an update for 12.1, I suggest opening a bug on
bugzilla.novell.com.
If you want to work with larger numbers of devices, I suggest getting the
mdadm from Factory - it has a number of fixes in this area.
Thanks,
NeilBrown
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