Giovanni Sciortino
2010-Apr-22 09:34 UTC
[Ocfs2-users] backup performance problem and snapshot
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? Giovanni Sciortino -------------- next part -------------- An HTML attachment was scrubbed... URL: http://oss.oracle.com/pipermail/ocfs2-users/attachments/20100422/48cd1bdb/attachment.html
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 asimple 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 > > _______________________________________________ > Ocfs2-users mailing list > Ocfs2-users at oss.oracle.com > http://oss.oracle.com/mailman/listinfo/ocfs2-users >-------------- next part -------------- An HTML attachment was scrubbed... URL: http://oss.oracle.com/pipermail/ocfs2-users/attachments/20100502/f734920b/attachment.html