[CentOS] Dell Equallogic
James A. Peltier
jpeltier at fas.sfu.ca
Wed Oct 14 17:36:01 UTC 2009
On Tue, 13 Oct 2009, Pasi Kärkkäinen wrote:
>
> Hmm.. what kind of problems do you have with snapshots?
Let's see
They take up 16MB of space regardless of the amount of data that changes.
A single bit changes and 16MB is taken up. This is not tunable.
Mounting a snapshot requires the generation of a new UUID for the file
system in order to be able to use it. Perhaps this is a XFS limitation,
but unlike ZFS they aren't immediately available. We need to perform this
action extensively to backup file systems and allow for quick data
recovery.
There is no GNU/Linux interface to automating the snapshot process. Sure
there is a telnet interface but it changes from version to version. I
know because I've spoken with engineers to discuss this issue. I wrote
software to talk to the EQL using the interface. There are talks of an
SDK for developers but nothing has materialized.
Don't get me wrong, it's a great device for cheap storage compared to
competitors but there are obvious limitations that you need to address in
your requirements if you intend to deploy it.
--
James A. Peltier
Systems Analyst (FASNet), VIVARIUM Technical Director
HPC Coordinator
Simon Fraser University - Burnaby Campus
Phone : 778-782-6573
Fax : 778-782-3045
E-Mail : jpeltier at sfu.ca
Website : http://www.fas.sfu.ca | http://vivarium.cs.sfu.ca
http://blogs.sfu.ca/people/jpeltier
MSN : subatomic_spam at hotmail.com
Does your OS has a man 8 lart?
http://www.xinu.nl/unix/humour/asr-manpages/lart.html
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