Re: [fedora-virt] uniquely identifying drives in virt configurations
On Wed, Feb 03, 2010 at 07:54:05PM -0500, Bill McGonigle wrote:
Hi, all,
I'm wondering what folks are doing for uniquely identifying plain disks
in their virtual machine configs.
For instance, I'm trying out the new Xen version and stuck a couple SATA
drives in a box. I'd like to use them as physical devices, but not
break my vm config if I re-cable the drives (or move them to another
machine).
I could create a degraded RAID mirror, and then reference them by mdX
and let md worry about the UUID's, but that's ugly. If I were using
luks on the drives they'd get tagged and could be referenced uniquely.
Same with iscsi, those are available uniquely under /sys.
Maybe something with device mapper? But I'm actually interested in
benchmarking ZFS through Xen with this, so I'd hate to add another layer
just for this purpose, since it's only needed at setup time. I could
script some ugly hacks but I'd rather not.
I was hoping to find a /sys/block/scsi/model/serialnumber type of thing
symlinked back to the ../../devices/pci... , but I didn't. So, I hope
I'm missing something obvious and folks here have this solved.
I suspect you are looking for /dev/disk/by-id whcih gives you a stable
links based on model/serial number details
$ ls -l /dev/disk/by-id/
total 0
lrwxrwxrwx. 1 root root 9 2010-02-03 18:04 ata-HTS721010G9SA00_MPCZ12Y0GNGWSE ->
../../sda
lrwxrwxrwx. 1 root root 10 2010-02-03 18:04 ata-HTS721010G9SA00_MPCZ12Y0GNGWSE-part1 ->
../../sda1
lrwxrwxrwx. 1 root root 10 2010-02-03 18:04 ata-HTS721010G9SA00_MPCZ12Y0GNGWSE-part2 ->
../../sda2
lrwxrwxrwx. 1 root root 9 2010-02-03 18:04 scsi-SATA_HTS721010G9SA00_MPCZ12Y0GNGWSE ->
../../sda
lrwxrwxrwx. 1 root root 10 2010-02-03 18:04 scsi-SATA_HTS721010G9SA00_MPCZ12Y0GNGWSE-part1
-> ../../sda1
lrwxrwxrwx. 1 root root 10 2010-02-03 18:04 scsi-SATA_HTS721010G9SA00_MPCZ12Y0GNGWSE-part2
-> ../../sda2
Daniel
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