Public bug reported:
Binary package hint: gnome-disk-utility
In a new testbed, 4 drive NAS type system with Ubuntu 10.10, I used the
Disk Utility with a pair of 160GB Seagate Barracuda 7200.7 (ST3160023AS)
drives. I initially created a mirror set and all was ok.
I then pulled the first 160GB drive (hot-swap) and plugged in a 2TB
WD20EARS "green" drive.
Disk Utility correctly changed the raid array to Degraded, and presented
the new clean 2TB drive. In the Raid Array configuration, I chose to
Edit the components and Add a new drive/partition to the raid set. I
selected the 2TB drive and the utility declared it would create a 160GB
partition leaving the rest of the disk free. All ok I thought, except
when I clicked through to complete the operation I received the error
message:
Error adding spare: mdadm exited with exit code 1: mdadm: /dev/sdb3 not
large enough to join array
How this happened is this. the original size of the partitions from the 160GB
disks were 160,041,833,984 bytes.
The partition that Disk Utility created were 160,039,239,680 bytes - obviously
- mdadm then rejected this partition as too small.
I manually created a partition (fdisk -u ) of sufficient size, and was
able to manually add this to the raidset with mdadm. The GUI tool did
not let me choose the existing partition to add to the set.
Separately, I note that the too begins at sector 63 on the disk - this
is bad thing to do on these large format drives since internally they
use 4KB block sizes and you should start/stop your blocks on these
boundaries. Defaulting to block 63 means that for every block write,
the drive must read the existing block, modify the bytes which will
change and rewrite the block. This slows down write access to approx
1MB/sec. When partitioning/formatting large format drives, you should
start at sector 64 (use -u flag to fdisk when doing this manually).
Thanks,
Paul Gregg
ProblemType: Bug
DistroRelease: Ubuntu 10.10
Package: gnome-disk-utility 2.30.1-2
ProcVersionSignature: Ubuntu 2.6.35-22.35-generic 2.6.35.4
Uname: Linux 2.6.35-22-generic i686
Architecture: i386
Date: Mon Nov 15 15:39:10 2010
InstallationMedia: Ubuntu 10.10 "Maverick Meerkat" - Release i386 (20101007)
ProcEnviron:
PATH=(custom, no user)
LANG=en_GB.utf8
SHELL=/bin/bash
SourcePackage: gnome-disk-utility
** Affects: gnome-disk-utility (Ubuntu)
Importance: Undecided
Status: New
** Tags: apport-bug i386 maverick
--
Gnome Disk Utilty calculates new raid partion sizes incorrectly.
https://bugs.launchpad.net/bugs/675604
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