[Ocfs2-users] backup performance problem and snapshot

[Elia Pinto]

2010/4/22 Giovanni Sciortino <giovannibattistasciortino at gmail.com>

> Hi,
> i'm using ocfs2-1.4.4-1 on a cluster of 16 nodes, each node uses rhel 5.4
> (kernel version 2.6.18-164.11.1) and it's connected to the other nodes with
> a 10Gb/s Ethernet.
> The ocfs cluster contains a Ocfs filesystem of 3 terabyte over a LVM logic
> volume, I use this filesystem to store the home directories of users.
> I need to backup this filesystem but there is a very low transfer rate(it's
> about 4MB/s) from the OCFS fs and the tape, i  try to copy the data from
> OCFS fs to a ext3 using cp and I obtain similar transfer rates.
> I use also another ocfs cluster of only two nodes in an another vlan of the
> same network and I obtain a transfer rate from OCFS fylesystem to other
> fylestem of 20 MB/s.
>
> Has anyone got a similar performance problems with OCFS clusters or some
> suggestions in order to solve this problem?
>
> Does OCFS provide a snapshot feature in order to backup quickly the OCFS
> filesystem?
>
> He, this is a good question. But none answer, and not because it is a
simple question IMHO that could be require as  an answer a simple RTFM. BTW,
in other distributed filesystem there exist a "freeze" function for doing
something as you asked, if also using something like a snapshot lvm or
hardware support, as you have observed already.

But probably there is no interest.

Regards

> Giovanni Sciortino
>
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