Re: mdadm doesn't wont to grow - help please

["Sergiusz Brzeziński" <Sergiusz.Brzezinski@supersystem.pl>]

W dniu 15.05.2012 02:14, NeilBrown pisze:
 > On Mon, 14 May 2012 15:49:53 +0200 Sergiusz Brzeziński
 > <Sergiusz.Brzezinski@supersystem.pl>  wrote:
 >
 >> Hi,
 >>
 >> I would like to grow the RAID1.
 >>
 >> - Raid1 size has about 50GB
 >> - two HD partition (sda2, sdb2) have about 80GB+ (each)
 >>
 >> I do:
 >>
 >> # mdadm --grow /dev/md0 --size=max
 >>
 >> and I get the info, that the new size is 50GB. And I wonder: why not 80GB? The
 >> size doesn't change! If I try to force size (--size=xxxxx), I get the message
 >> that there is no space.
 >>
 >> What did I wrong?
 >
 > Probably used an ancient version of mdadm - more than a couple of months
 > old :-)
 >
 > If you
 >    for i in /sys/block/md0/md/dev*/size
 >    do echo 0>  $i
 >    done
 > then try again it might work better.
 >
 > Newer mdadm (since May 2011) do this for you.
 >
 > If you look at the "mdadm -E /dev/sda2" output before and after you will
 > notice that "Avail Dev Size" changes.
 >
 > You can achieve the same effect by stopping the array, the assembling it
 > with --update=devicesize
 >
 >    mdadm --stop /dev/md0
 >    mdadm --assemble /dev/md0 --update=devicesize /dev/sd[ab]2
 >    mdadm --grow /dev/md0 --size=max
 >
 > NeilBrown
[...]

Hi,

Yes, that helped!

Bevore:

  Avail Dev Size : 104855552 (50.00 GiB 53.69 GB)
      Array Size : 104855552 (50.00 GiB 53.69 GB)



# echo 0 > /sys/block/md1/md/dev-sda2/size


After:

Avail Dev Size : 175625584 (83.74 GiB 89.92 GB)
      Array Size : 104855552 (50.00 GiB 53.69 GB)
   Used Dev Size : 104855552 (50.00 GiB 53.69 GB)


And now:
# mdadm --grow /dev/md1 --size=max
works as expected

thank's a lot

best regards

Sergiusz
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