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

To: xfs@xxxxxxxxxxx
Subject: [PATCH 0/8] xfsdump: enable support for multiple streams
From: Bill Kendall <wkendall@xxxxxxx>
Date: Wed, 2 Nov 2011 16:10:46 -0500
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.

There's a bit more work to do:

  - Now that xfsdump has threads once again, the tape I/O ring
    buffer support can be enabled. This series leaves it disabled
    so that more testing can be done in that area.

  - Currently the stream split points are determined by doing an
    extra inode scan. This is unchanged from how it was done on
    IRIX. I'd like to change this so that enough info is kept from
    the initial inode scan to determine appropriate split points
    without an additional scan.

  - You may notice in the last patch of this series that a lot
    of "miniroot" references also look at whether or not the dump
    is to a pipe. Now that the "miniroot" checks are gone, it's
    possible to clean up the pipe-related code too. I've got a
    separate patch series for that which I'll submit later.

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