On Fri, 23 Jul 2004, Neil Brown wrote:
> On Wednesday July 7, Holger.Kiehl@xxxxxx wrote:
> >
> > Is it possible to influence the order at which the spares are taken
> > from the group? Reason is that I have four spare partitions on two
> > ide disks (2 partitions on each disk). Removing a second disk I
> > noticed it picked the second partition from the same disk. The spares
> > where added in this order hde7 hda7 hde6 hda6, but mdadm picked hde7
> > and then hde6. Better would be hde then hda.
>
> No, it is not possible to do that reliably.
>
> mdadm will tend to choose the first one it finds. So if you add the
> best choices as spared first, and then add the poorer choices, it
> might be more likely to choose the one you want.
>
No this does not work. I have added the spares in the following order:
hda7 hde7 hda6 hde6
Here what /proc/mdstat says:
Personalities : [raid0] [raid1]
md6 : active raid0 md3[0] md5[2] md4[1]
215310528 blocks 64k chunks
md1 : active raid1 hde3[1] hda3[0]
4016128 blocks [2/2] [UU]
md2 : active raid1 hde5[1] hda5[0]
4007936 blocks [2/2] [UU]
md3 : active raid1 hde6[2] hda6[3] hde7[4] hda7[5] sdd1[1] sda1[0]
71770240 blocks [2/2] [UU]
md4 : active raid1 sde1[1] sdb1[0]
71770240 blocks [2/2] [UU]
md5 : active raid1 sdf1[1] sdc1[0]
71770240 blocks [2/2] [UU]
md0 : active raid1 hde2[1] hda2[0]
29197824 blocks [2/2] [UU]
unused devices: <none>
So this looks just like what I want. But after boot it looks as follows:
Personalities : [raid0] [raid1]
md6 : active raid0 md3[0] md5[2] md4[1]
215310528 blocks 64k chunks
md1 : active raid1 hde3[1] hda3[0]
4016128 blocks [2/2] [UU]
md2 : active raid1 hde5[1] hda5[0]
4007936 blocks [2/2] [UU]
md3 : active raid1 sdd1[1] sda1[0] hde7[2] hde6[3] hda7[4] hda6[5]
71770240 blocks [2/2] [UU]
md4 : active raid1 sde1[1] sdb1[0]
71770240 blocks [2/2] [UU]
md5 : active raid1 sdf1[1] sdc1[0]
71770240 blocks [2/2] [UU]
md0 : active raid1 hde2[1] hda2[0]
29197824 blocks [2/2] [UU]
unused devices: <none>
md3 is started via raid autodetect. How can I tell md the order of spares?
Thanks,
Holger
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