[Bug 1441930] Re: Fix handling of multipathed disks with 4k-sectors
Chris J Arges
1441930 at bugs.launchpad.net
Wed Jul 15 19:28:57 UTC 2015
Hello Mauricio, or anyone else affected,
Accepted multipath-tools into trusty-proposed. The package will build
now and be available at https://launchpad.net/ubuntu/+source/multipath-
tools/0.4.9-3ubuntu7.3 in a few hours, and then in the -proposed
repository.
Please help us by testing this new package. See
https://wiki.ubuntu.com/Testing/EnableProposed for documentation how to
enable and use -proposed. Your feedback will aid us getting this update
out to other Ubuntu users.
If this package fixes the bug for you, please add a comment to this bug,
mentioning the version of the package you tested, and change the tag
from verification-needed to verification-done. If it does not fix the
bug for you, please add a comment stating that, and change the tag to
verification-failed. In either case, details of your testing will help
us make a better decision.
Further information regarding the verification process can be found at
https://wiki.ubuntu.com/QATeam/PerformingSRUVerification . Thank you in
advance!
** Changed in: multipath-tools (Ubuntu Trusty)
Status: Triaged => Fix Committed
** Tags added: verification-needed
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https://bugs.launchpad.net/bugs/1441930
Title:
Fix handling of multipathed disks with 4k-sectors
Status in multipath-tools package in Ubuntu:
Fix Released
Status in parted package in Ubuntu:
Fix Released
Status in multipath-tools source package in Trusty:
Fix Committed
Status in parted source package in Trusty:
Triaged
Bug description:
The packages for libparted and kpartx don't have the patches for using
multipath (actually device-mapper) on 4k-sector disks (generally: 'non
512-byte sector disks')
This causes the number of sectors of each device-mapper partition to be 1/8th (512/4096) of that expected.
These 3 errors were identified:
1) Partition sizes on multipath are 1/8th of the intended size
2) The filesystem on the underlying device is not-accessible (only in the dm mapped device)
3) grub-install fails w/ 'Unknown filesystem'
The 2 patches attached contains upstream patches from parted and
multipath-tools, and fix the issues (the installation finishes without
errors and the system boots).
QEMU/KVM
--------
If you don't have 4k-sector disks handy :)
An example for multipath on 4k-sector disks, with 2 underlying
devices:
$ qemu-img create -f raw disk.img 16g
$ qemu-system-ppc64 -enable-kvm \
-nographic -nodefaults \
-monitor stdio -serial pty \
-M pseries -m 2G \
-net nic -net user \
-drive media=cdrom,file=../../iso/vivid-server-ppc64el.iso.0408 \
\
-drive file=disk.img,if=none,cache=none,serial=my-serial,id=drive0 \
-drive file=disk.img,if=none,cache=none,serial=my-serial,id=drive1 \
-device scsi-hd,physical_block_size=4096,logical_block_size=4096,drive=drive0 \
-device scsi-hd,physical_block_size=4096,logical_block_size=4096,drive=drive1
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