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SubjectRe: Switching from (deprecated) IDE driver -> SATA (PATA support)

On Sun, 25 Jan 2009, Alan Cox wrote:

> Easiest is to use labels. Old ide will keep hda,b,c,d constant
> providing you have interfaces using the legacy IDE port mappings (0x1f0
> and 0x170). Libata doesn't do that as pretty much every distribution had
> already switched to volume labels, and the user space can do the job far
> better than the kernel - especially as the newer devices with modern
> interfaces don't have the old BIOS/DOS legacy ideas any more.
> Mount by label also means you can flip back and forth between the
> different drivers and kernel revisions.
> Alan

That works well with ext* filesystems as one can set it anytime with
e2label if I recall; however, how can one do this with XFS, is it
possible without booting off a boot-cd etc?

Here is the filesystem information:
p254:~# xfs_info /dev/sdd2
meta-data=/dev/root isize=256 agcount=16, agsize=1186676 blks
= sectsz=512 attr=0
data = bsize=4096 blocks=18986816, imaxpct=25
= sunit=0 swidth=0 blks
naming =version 2 bsize=4096
log =internal bsize=4096 blocks=9270, version=1
= sectsz=512 sunit=0 blks, lazy-count=0
realtime =none extsz=65536 blocks=0, rtextents=0

When I try to label it:
p254:~# xfs_admin -L "root" /dev/sdd2
xfs_admin: /dev/sdd2 contains a mounted filesystem

fatal error -- couldn't initialize XFS library

The label is currently not set:
p254:~# xfs_admin -l /dev/sdd2
label = ""

I guess my next step is to try UUID?

Instead of giving the device explicitly, one may indicate the (ext2 or
xfs) filesystem that is to be mounted by its UUID or volume label (cf.
e2label(8) or xfs_admin(8)), writing LABEL=<label> or UUID=<uuid>,
e.g., `LABEL=Boot' or `UUID=3e6be9de-8139-11d1-9106-a43f08d823a6'.
This will make the system more robust: adding or removing a SCSI disk
changes the disk device name but not the filesystem volume label.

p254:~# xfs_admin -U generate /dev/sdd2
xfs_admin: /dev/sdd2 contains a mounted filesystem

fatal error -- couldn't initialize XFS library

Hmm, am I out of luck?


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