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тАО06-11-2009 09:57 AM
тАО06-11-2009 09:57 AM
Polyserve Matrix FS 3.51 backup solutions
I'm am now finding myself troubleshooting why my Tivoli TSM cannot scan and backup files any faster than it does. If I use the same node/server to backup the nodes local fs (non PSFS) I get great speeds. Using standard "rsync" works well also. What gives? I think these enterprise backup solutions don't know how to handle the PSFS. How are you backing up your Polyserve Linux cluster?
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тАО06-11-2009 07:38 PM
тАО06-11-2009 07:38 PM
Re: Polyserve Matrix FS 3.51 backup solutions
I cannot give a recommendation on how best to back up your data, especially when it comes to recommending a specific brand.
I will say that specific system calls are more expensive on a clustered filesystem than they are on a stand-alone filesystem. Calls such as stat() require a cluster-wide flush of the file to ensure accurate results. This means that rsync and incremental backups will be impacted, as they need to compare each and every file, meaning a lot of cache flushing.
This is also typically more pronounced on a filesystem with many small files as opposed to few large files, although it's apples-and-oranges between a clustered filesystem and a traditional single-node filesystem.
I do hope to hear back from others' on how they perform backups best. I'm curious to hear as well.
I will say that specific system calls are more expensive on a clustered filesystem than they are on a stand-alone filesystem. Calls such as stat() require a cluster-wide flush of the file to ensure accurate results. This means that rsync and incremental backups will be impacted, as they need to compare each and every file, meaning a lot of cache flushing.
This is also typically more pronounced on a filesystem with many small files as opposed to few large files, although it's apples-and-oranges between a clustered filesystem and a traditional single-node filesystem.
I do hope to hear back from others' on how they perform backups best. I'm curious to hear as well.
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тАО08-02-2009 02:00 PM
тАО08-02-2009 02:00 PM
Re: Polyserve Matrix FS 3.51 backup solutions
There are alot of issues in the performance of backup software.
The previous author mentioned the stat system call which is quite a issue for polyserve. In addition if you have lots of small files in a single subdirectlry level 100K that will also not be optimal. Are the other nodes in the cluster reading and writing the same files while they are being backed up ?
We need some information on the types of files and access pattern to help. Remember that if your storage is EVA you could do a snapshot and mount the snapshot on a certain node and backup from the snapshot.
rsyncing the files to a temporary space so the files are not being accessed and backing them up from there is a reasonable option too. In fact the new 3.7 version of polyserve has a replication functionality between clusters feature that uses rsync.
Yes 3.7 is out.
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