Re: moving the /var partition [SOLVED]
From: Bill Tangren (bjt_at_aa.usno.navy.mil)
Date: 10/23/03
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To: redhat-list@redhat.com Date: Thu, 23 Oct 2003 16:50:07 -0400
Peter B. West wrote:
> Bill,
>
> This is getting a bit confused. You say you have just installed a new
> disk, yet you also say you want to reduce a 60Gb /var partition. If you
> are installing a new disk, you can decide at the outset how big a /var
> partition you want. I would go back to the beginning, decide how big I
> wanted my var to be, and partition the new disk accordingly. Decide
> what you want ot do with the rest of the disk, e.g., /opt, /usr2 or
> whatever. Partition accordingly. Whatever tool you use will tell you
> the /dev/hd? name of your new partitions. Build your filesystem(s) on
> the new disk. Then follow the instructions abotu temporary mounts.
>
> I would enter the values for the temporary mount in /etc/fstab, making
> sure to create the mount point for your temporary var - say /mnt/var. If
> these things match you will be able to issue
> # mount /mnt/var
>
> Do the copy using cpio or cp. If using cp I would try -ax (i.e. -dpRx).
> If using cpio, I would probably add --sparse to the args, just in case
> it saves some space.
>
> Now modify the /etc/fstab. Where is your current /usr? Is it a
> directory on the / partition? /usr is a critical partition istself. As
> you have a new disk, I would *first* bring the /var partition up in its
> new home, then sort /usr out. In either case, don't touch /usr to start
> with. It sounds as though /var is currently a partition. Change the
> /var mount point to the newly created partition, and change the current
> /var partition to mount on /mnt/var. Reboot. If all goes well, this
> process will be transparent.
>
> Then do something similar for your current /usr. Delete the contents of
> /mnt/var. (Be careful where you are. You might be better to create a
> /mnt/newusr directory, and in the previous step, change the old /var
> partition mount point to /mnt/newusr, just so that the names don't get
> confused.) Do the copy of the current contents of /usr to the old var
> partition as you have mounted it. Change /etc/fstab to mount the old
> var partition as /usr. Reboot.
>
> As suggested, I would use the device names for all of this, (/dev/hdb1,
> etc), and sort out the labels later.
>
> Incidentally, f wither /var or /usr is currently a directory in the /
> file system, rather than a mounted partition, you will have to arrange
> to delete the old contents of the directory when everything is working.
> The best way to do that would be to boot in rescue mode, and delete the
> directory contents from /mnt/sysimage, after making sure you didn't have
> the new partitions mounted there. I don't know how rescue treats
> mounted partitons, but I assume they are mounted at the approproate
> points under /mnt/sysimage.
>
> Peter
>
Sorry about the confusion. I was trying to solve several problems at
once, and should not have mentioned them all in one email.
This is what I did to solve my problem:
On a test machine, I installed the new hd, then used fdisk to partition
it. I ran into problems, I think because I said one partition was
extended, and not primary. Anyhow, I put two primary partitions on the
disk, then used
# mke2fs -jc /dev/hdb1
# mke2fs -jc /dev/hdb2
to put an ext3 file system on the partitions. Having forgot to label
them, I used
# tune2fs -L /var /dev/hdb1
# tune2fs -L /usr /dev/hdb2
I then mounted them and used
# rsync -e ssh -avz doggett:/var/ /mnt/var
# rsync -e ssh -avz doggett:/usr/ /mnt/usr
to get the data off the old partitions. I then altered the /etc/fstab on
the production machine. Next, I shut down both machines, swaped disks,
and restarted them.
Worked like a charm.
THANKS to everyone for their help. One of the key piece of information I
didn't have was that tune2fs can be used on ext3 file systems. The man
pages didn't state that.
Thanks again,
Bill
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- Previous message: Atif Malik: "Re: email critical logs to me"
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