Re: fsid change of ZFS?
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Hi Rick,
Rick Macklem <rmacklem@uoguelph.ca> wrote
in <468764384.310026.1314219682612.JavaMail.root@erie.cs.uoguelph.ca>:
rm> It sounds like people have agreed that this is a reasonable solution.
rm> If hrs@ can confirm that testing shows it fixes the original problem
rm> (the ZFS file handles don't change when it's loaded at different times),
rm> I'll pass it along to re@.
I am sorry for the delay, but I tried the patch on several boxes and
it worked fine:
[old (fixed array) patch]
% lsvfs
Filesystem Num Refs Flags
-------------------------------- --- ----- ---------------
ufs 2 3
oldnfs 15 0 network
zfs 7 4 jail, delegated-administration
nfs 6 1 network
cd9660 1 0 read-only
procfs 3 0 synthetic
devfs 4 1 synthetic
msdosfs 5 0
[new (hash-based) patch]
Filesystem Num Refs Flags
-------------------------------- --- ----- ---------------
ufs 53 3
oldnfs 77 0 network
zfs 222 4 jail, delegated-administration
nfs 58 0 network
cd9660 189 0 read-only
procfs 2 0 synthetic
devfs 113 1 synthetic
msdosfs 50 0
[new patch, different loading order of kld modules]
Filesystem Num Refs Flags
-------------------------------- --- ----- ---------------
ufs 53 3
zfs 222 4 jail, delegated-administration
cd9660 189 0 read-only
procfs 2 0 synthetic
devfs 113 1 synthetic
msdosfs 50 0
nfs 58 0 network
Thanks a lot for the patch. I think it should be committed before
9.0R is released.
Even for 8-STABLE this is useful but there is a problem that it will
make an incomptibility of the fsid calculation between 8.N and
8.(N+1). What do you think about adding a loader tunable (something
like vfs.fsidhash) to control this and making it disable by default?
It would help sysadmins who will try a upgrade from 8.X to 9.X in the
future, I think.
-- Hiroki
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