ReiserFS + LVM
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| Author | Content |
|---|---|
| amadensor Nov 30, 2009 4:37 PM EDT |
If using ReiserFS on LVM, you can expand the file system hot, without unmounting. Just expand the LV with lvresize, then run resize_reiserfs, and it is done, no unmounting needed. This is the reason I have not moved to EXT3 or 4. I can expand file systems without unmounting. I only need to take the system down to add drives, and that is just a simple reboot. |
| Sander_Marechal Nov 30, 2009 5:19 PM EDT |
Eh? You can grow ext2, ext3 and ext4 online since kernel 2.6.7. IIRC you just can't shrink them online. |
| amadensor Nov 30, 2009 7:07 PM EDT |
I have tried. It always complains that you cannot modify a mounted file system. I am on 2.6.30. Go try it, and let me know. Maybe there is a newer version of the EXT FS Tools. or something. I am on Debian Squeeze. |
| Sander_Marechal Nov 30, 2009 7:39 PM EDT |
@amadensor: I don't have any filesystems I can resize at the moment. But the resize2fs manpage on Squeeze says this:Quoting: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.). So, it's only ext3 and not ext2/4 as I said in my previous post. It should work (it will generate a warning saying the filesystem is mounted and that online resizing is required. It should work. If it does not, it's a bug in Squeeze. |
| jezuch Dec 01, 2009 3:06 AM EDT |
On the other hand XFS support online resize *only* :) |
| gus3 Dec 01, 2009 3:47 AM EDT |
XFS prefers to use a copy-and-examine mechanism that works in online filesystems only. |
| Sander_Marechal Dec 01, 2009 4:34 AM EDT |
jezuch: "Online grow" would be more correct. XFS cannot be shrunk. |
| hkwint Dec 01, 2009 5:19 PM EDT |
Just tested this on 2.6.28-gentoo-r5 #5 SMP GNU/Linux on a 100M ext3-filesystem and it seems to work: #mount -l /dev/mapper/vg0-testlv on /mnt/tmp type ext3 (rw) #lvextend /dev/vg0/testlv -L+10M #resize2fs /dev/vg0/testlv resize2fs 1.41.9 (22-Aug-2009) Filesystem at /dev/vg0/testlv is mounted on /mnt/tmp; on-line resizing required old desc_blocks = 1, new_desc_blocks = 1 Performing an on-line resize of /dev/vg0/testlv to 114688 (1k) blocks. The filesystem on /dev/vg0/testlv is now 114688 blocks long. |
| hkwint Dec 01, 2009 5:27 PM EDT |
Also works for ext4. |
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