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[rhelv5-list] Online resizing of ext3 filesystems?



Hi,

I'm still "playing around" with RHEL5 before any major production
deployment, and just bumped into a limitation I really didn't expect...
it seems like online resizing of ext3 filesystems no longer works (vs.
RHEL4 where it works fine with "ext2online").

First of all, it took me a while to find out what command to use for
ext3 resizing... I remember the good old "e2fsadm" from the RHEL3 days,
the "ext2online" I still use a log with RHEL4, and now it's yet another
tool with a completely different name : resize2fs.

>From the man page :

"The resize2fs program will resize ext2 or ext3 file systems.
It can be used  to  enlarge or shrink an unmounted file system located
on device. If the filesystem is mounted, it can be used to expand the
size of  the mounted filesystem, assuming the kernel supports on-line
resizing.  (As of this writing, the Linux  2.6  kernel  supports
on-line  resize  for filesystems mounted using ext3 only.)."

Well, RHEL5 has a 2.6 kernel, *but* when trying to resize a mounted
partition I get a "can't resize a mounted filesystem!" message :-(

I was really hoping I would be able to grow the ext3 formatted logical
volume I use as a phy device with Xen from "underneath" the Xen guest
system, and have it "just work", but apparently that isn't the case...
the guest must be completely stopped and e2fsck run before the
partition can be resized.

Oh, and for the brave : Save yourself some time and don't even try
to resize the partition with the Xen guest only paused or saved... it
doesn't go smoothly at all. It had been a long time since I had to run
e2fsck so many times :-(

Does anyone know if online ext3 resizing has been disabled for some
reason? Is there any way to resize a Xen guest's "/" filesystem "on the
fly"?

Matthias

-- 
Clean custom Red Hat Linux rpm packages : http://freshrpms.net/
Fedora Core release 6 (Zod) - Linux kernel 2.6.20-1.2943.fc6
Load : 0.26 0.18 0.17


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