Hi.
I want to make a snapshot from a logical volume and noticed that there must be enough free disk space in the volume group. Actually there is no free disk space left. How do i shrink online /var without losing any data or restore from backup? I do not have physical access to the server.
Specs:
Dell PE SC1430 with a 5/i RAID Controller one RAID 1 array from the Dell RAID controller 2 partitons (boot and LVM) 1 VG 3 LV (swap, /var (/dev/VolGroup00/LogVol02) and / formatted with ext3) /dev/mapper/VolGroup00-LogVol02 211G 39G 162G 20% /var
Thank you in advance.
Thomas Antony
On Tue, Sep 04, 2007 at 12:40:24PM +0200, Thomas Antony wrote:
Hi.
I want to make a snapshot from a logical volume and noticed that there must be enough free disk space in the volume group. Actually there is no free disk space left. How do i shrink online /var without losing any data or restore from backup?
You can't shrink ext2/ext3 filesystems online. You'll have to schedule a downtime.
Another solution is to remove and use a file for swap (swapoff ... && lvremove ...), or reduce it (swapoff ... && lvreduce ... && mkswap && swapon).
Luciano Rocha schrieb:
On Tue, Sep 04, 2007 at 12:40:24PM +0200, Thomas Antony wrote:
Hi.
I want to make a snapshot from a logical volume and noticed that there must be enough free disk space in the volume group. Actually there is no free disk space left. How do i shrink online /var without losing any data or restore from backup?
You can't shrink ext2/ext3 filesystems online. You'll have to schedule a downtime.
Another solution is to remove and use a file for swap (swapoff ... && lvremove ...), or reduce it (swapoff ... && lvreduce ... && mkswap && swapon).
Hi.
Is it possible that i log into the server with ssh and umount only /var and then resize the logical volume?
Thomas
From: centos-bounces@centos.org [mailto:centos-bounces@centos.org] On Behalf Of Thomas Antony
Luciano Rocha schrieb:
On Tue, Sep 04, 2007 at 12:40:24PM +0200, Thomas Antony wrote:
Hi.
I want to make a snapshot from a logical volume and
noticed that there must
be enough free disk space in the volume group. Actually
there is no free
disk space left. How do i shrink online /var without losing any data or
restore from backup?
You can't shrink ext2/ext3 filesystems online. You'll have
to schedule a
downtime.
Another solution is to remove and use a file for swap
(swapoff ... &&
lvremove ...), or reduce it (swapoff ... && lvreduce ... &&
mkswap && swapon).
Hi.
Is it possible that i log into the server with ssh and umount only /var and then resize the logical volume?
Maybe in single user mode, but /var is needed for multi-user mode to function.
Remember: if shrinking, shrink filesystem first then LV, if expanding then expand the LV first then the filesystem.
-Ross
______________________________________________________________________ This e-mail, and any attachments thereto, is intended only for use by the addressee(s) named herein and may contain legally privileged and/or confidential information. If you are not the intended recipient of this e-mail, you are hereby notified that any dissemination, distribution or copying of this e-mail, and any attachments thereto, is strictly prohibited. If you have received this e-mail in error, please immediately notify the sender and permanently delete the original and any copy or printout thereof.
Thomas Antony wrote:
Is it possible that i log into the server with ssh and umount only /var and then resize the logical volume?
Try it. Most probably the system will tell you that the disk is in use. What you could do then is booting from a live CD and resize it from there (System will be offline, of course).
Regards Sebastian
On Tue, Sep 04, 2007 at 03:26:53PM +0200, Thomas Antony wrote:
Luciano Rocha schrieb:
On Tue, Sep 04, 2007 at 12:40:24PM +0200, Thomas Antony wrote:
Hi.
I want to make a snapshot from a logical volume and noticed that there must be enough free disk space in the volume group. Actually there is no free disk space left. How do i shrink online /var without losing any data or restore from backup?
You can't shrink ext2/ext3 filesystems online. You'll have to schedule a downtime. Another solution is to remove and use a file for swap (swapoff ... && lvremove ...), or reduce it (swapoff ... && lvreduce ... && mkswap && swapon).
Hi.
Is it possible that i log into the server with ssh and umount only /var and then resize the logical volume?
Yes, but you'll have to stop a lot of daemons and other processes that run with files opened in /var.
You can find the processes accessing /var with lsof or fuser: # fuser -mv /var # lsof /var
Is it possible that i log into the server with ssh and umount only /var and then resize the logical volume?
Yes, but you'll have to stop a lot of daemons and other processes that run with files opened in /var.
You can find the processes accessing /var with lsof or fuser: # fuser -mv /var # lsof /var
I stopped all services except sshd and fuser and lsof doesn't show me any files, but i still can't unmount /var :-(
# umount /var umount: /var: device is busy umount: /var: device is busy
Ayn ideas?
Thomas
From: centos-bounces@centos.org [mailto:centos-bounces@centos.org] On Behalf Of Thomas Antony
Is it possible that i log into the server with ssh and
umount only /var and
then resize the logical volume?
Yes, but you'll have to stop a lot of daemons and other
processes that
run with files opened in /var.
You can find the processes accessing /var with lsof or fuser: # fuser -mv /var # lsof /var
I stopped all services except sshd and fuser and lsof doesn't show me any files, but i still can't unmount /var :-(
# umount /var umount: /var: device is busy umount: /var: device is busy
Ayn ideas?
/var is required for multi-user mode.
Try bringing the system to single-user mode 'init 1' and then try it.
-Ross
______________________________________________________________________ This e-mail, and any attachments thereto, is intended only for use by the addressee(s) named herein and may contain legally privileged and/or confidential information. If you are not the intended recipient of this e-mail, you are hereby notified that any dissemination, distribution or copying of this e-mail, and any attachments thereto, is strictly prohibited. If you have received this e-mail in error, please immediately notify the sender and permanently delete the original and any copy or printout thereof.
/var is required for multi-user mode.
Try bringing the system to single-user mode 'init 1' and then try it.
-Ross
Hi.
single-user mode is a problem because i don't have physical access to the server.... I will try to get some remote hands. Thank you everybody for your help!
kind regards, Thomas
On Tue, Sep 04, 2007 at 08:18:18PM +0200, Thomas Antony wrote:
Is it possible that i log into the server with ssh and umount only /var and then resize the logical volume?
Yes, but you'll have to stop a lot of daemons and other processes that run with files opened in /var. You can find the processes accessing /var with lsof or fuser: # fuser -mv /var # lsof /var
I stopped all services except sshd and fuser and lsof doesn't show me any files, but i still can't unmount /var :-(
# umount /var umount: /var: device is busy umount: /var: device is busy
Ayn ideas?
Are you using chrooted BIND?
Do a cat /proc/mounts, search for var, and unmount anything in use.
# umount /var umount: /var: device is busy umount: /var: device is busy
Ayn ideas?
Are you using chrooted BIND?
Do a cat /proc/mounts, search for var, and unmount anything in use.
# cat /proc/mounts | grep var /dev/VolGroup00/LogVol02 /var ext3 rw,data=ordered 0 0
I can't unmount var. I think it is like Ross already wrote, that /var can't be unmounted in multi-user mode. It would be nice if someone could explain why /var is unmountable, even when "fuser -mv /var" and "/lsof /var" doesn't return any files.
Thomas
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Luciano Rocha -
Ross S. W. Walker -
Sebastian Walter -
Thomas Antony