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Re: Parallel dumps of a single file system?
2006-05-23 10:02:34
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Subject: |
Re: Parallel dumps of a single file system? |
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From: |
Andreas Hallmann <hallmann AT ahatec DOT de> |
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Date: |
Tue, 23 May 2006 15:56:05 +0200 |
Paul Lussier wrote:
Hi all,
I have a 1 TB RAID5 array which I inherited. The previous admin
configured it to be a single file system as well. The disklist I have
set up currently splits this file system up into multiple DLEs for
backup purposes and dumps them using gtar.
In the past, on systems with multiple partitions, I would configure
all file systems on different physical drives to be backed up in
parallel. Since this system has but 1 file system, I've been backing
them up one at a time.
But since this is a RAID array, it really wouldn't matter whether this
were many file systems or 1, since everything is RAIDed out across all
disks, would it?
There is nothing to RAID out. Avoiding spindle movement is both the key
longer disk life time and performance.
Since in the raid blocks are spreed sequentially (w.r.t the file) among
most (raid5) of the avail platters, it will behave more like a single
spindle with more layers.
So, my question is this: Am I doing the right thing by dumping these
DLEs serially, or can I dump them in parallel?
Dumping this DLEs sequentially is your only option to keep spindle
movements low. So your doing it the way I would do it.
Anything else should reduce your throughput.
Andreas
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