Hi,
I am trying to shrink an md partition to lower its size but that fails with
an error message.
My context is the following:
/dev/md2 has 3 partitions: /dev/sdb3; /dev/sdc3; /dev/sdd3
The array is 480 Gbytes big (only 30 Gbytes used).
I want to resize it to 100Gbytes (hosting company only allows that size).
Following a procedure, I first resize the partition to 70Gbytes to let some
space:
umount /dev/md2
e2fsck /dev/md2
resize2fs /dev/md2 70G
Then, I disable the bitmap:
mdadm --grow /dev/md2 --bitmap none
And I shrink the array to 100Gbytes (201x512x1024):
mdadm --grow /dev/md2 --size=105381888
Doing this, it produces the following error message:
mdadm: Cannot set size on array members.
mdadm: Cannot set device size for /dev/md2: Device or resource busy
If I look at the messages with "dmesg | tail" there is no error message due
to that manipulation.
Some things to check:
1. No rebuild is in progress (with cat /proc/mdstat): OK
2. The array is unmounted: OK
3. The proble doesn't come from the bitmap as it has been disabled before.
OK
4. Opened files related to the md2 device are the following:
lsof | grep md2
md2_raid1 403 root cwd DIR 9,91 4096 2 /
md2_raid1 403 root rtd DIR 9,91 4096 2 /
md2_raid1 403 root txt unknown /
proc/403/exe
I don't know if this is ok or not but I assume it is fine as I didn't mount
the array and didn't put any file on it in this session.
The versions of my system are the following:
Linux CentOS 6.3
mdadm V3.2.3
Thanks for any help.
Daniel
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