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Re: [PATCH 0/8] xfsdump: enable support for multiple streams

To: Christoph Hellwig <hch@xxxxxxxxxxxxx>
Subject: Re: [PATCH 0/8] xfsdump: enable support for multiple streams
From: Bill Kendall <wkendall@xxxxxxx>
Date: Thu, 03 Nov 2011 07:11:42 -0500
Cc: xfs@xxxxxxxxxxx
In-reply-to: <20111103101908.GA8572@xxxxxxxxxxxxx>
References: <1320268254-20583-1-git-send-email-wkendall@xxxxxxx> <20111103101908.GA8572@xxxxxxxxxxxxx>
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On 11/03/2011 05:19 AM, Christoph Hellwig wrote:
On Wed, Nov 02, 2011 at 04:10:46PM -0500, Bill Kendall wrote:
This series resurrects the IRIX multi-stream support for splitting a
backup among several output files/tapes. This offers some nice
performance improvements, particularly in xfsrestore where a single
stream often cannot keep the filesystem/disks busy. I've observed
a 1.7x improvement on a backup and a 5x improvement on restore.

I have a couple of xfstests for this, and will submit those once
a few outstanding xfsdump test patches have been reviewed.

I've put both your two previous xfsdump patches and the all your
xfstests changes into the kernel.org repositories.  They all look
fine to me.

Thanks for the reviews. I'm going to be out of town for a few days
but will look at your suggestion to use POSIX semaphores when I
return.


Btw, one thing I'd love to see is a script that uses the userspace
iscsi target (tgt) infrastructure to emulate a tape, and thus allow to
run the tape tests in any VM without requiring a real tape device.

Maybe there is someone on the list feels challenged by this?

I've been using an open source vtl to achieve the same goal, and have
given some thought to integrating (or at a minimum documenting) how
to use it with the xfsdump tests.

https://github.com/markh794/mhvtl

Bill

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