[prev in list] [next in list] [prev in thread] [next in thread] 

List:       evms-devel
Subject:    Re: [Evms-devel] How full is my snapshot partition?
From:       Kevin Corry <corryk () us ! ibm ! com>
Date:       2002-04-05 14:32:14
[Download RAW message or body]

Hi Dave,

When you create an EVMS snapshot, you will get a new entry in 
/proc/evms/snapshot/, with the same name as the snapshot volume. That file 
will contain various info about the snapshot, including the name of the 
original volume, and percentage full for the snapshot. You could easily write 
a script to grep that proc entry and alert you when the snapshot reaches a 
certain capacity.

If the snapshot does fill up, it will be disabled. Any further I/O requests 
to the snapshot will return errors. I/O requests to the original will not be 
affected.

One other note: If you have a journaled filesystem on the original, make sure 
you apply the appropriate VFS locking patch to your kernel source. These 
patches are available in the "kernel" directory in the EVMS 1.0.0 package, 
and should be applied after the EVMS code has been patched into the kernel. 
Or you can just make your snapshots writeable, which I know makes ReiserFS 
and XFS a whole lot happier.

-Kevin


On Friday 05 April 2002 08:27, Dave Alden wrote:
> Hi,
>   I'm considering creating a daily snapshot so my users can always have an
> online backup copy of their files in case they make some mistake.  The one
> thing I can't figure out is if there's anyway to check how full the
> snapshot volume is.  I'm planning on using a 36G drive (I don't think my
> users would make more changes than that), but I'm a little worried about
> filling it up. I'd like to write a monitor script that will page me if the
> snapshot volume begins to fill up.  One other quick question, what will
> happen if the users do fill up the snapshot volume?
> ...thnx,
> ...dave
>

_______________________________________________
Evms-devel mailing list
Evms-devel@lists.sourceforge.net
To subscribe/unsubscribe, please visit:
https://lists.sourceforge.net/lists/listinfo/evms-devel
[prev in list] [next in list] [prev in thread] [next in thread]