[Ocfs2-users] backup performance problem and snapshot

[Karim Alkhayer]

Hi,

 

For backup; I'm assuming you'd like to have exactly the same FS on another
mount point, try rsync. First time only will be slower as you're backing up
everything, then the rest shall be incremental (rsyinc will process the
delta only); you could use the -av option.

 

For the second issue, slow copy; try to ftp  instead (internally, on the
same host; ssh to the other lan then ftp get, dummy workaround, but works
sometimes, and normally faster than the standard cp).

 

Hope that help

 

Best regards,

Karim Alkhayer

 

From: ocfs2-users-bounces at oss.oracle.com
[mailto:ocfs2-users-bounces at oss.oracle.com] On Behalf Of Elia Pinto
Sent: Sunday, May 02, 2010 2:53 PM
To: Giovanni Sciortino
Cc: ocfs2-users at oss.oracle.com
Subject: Re: [Ocfs2-users] backup performance problem and snapshot

 

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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