Cabot, Mason B wrote:
I've been testing the NAS performance of ext3/Openfiler 2.2 against
NTFS/WinXP and have found that NTFS significantly outperforms ext3 for
video workloads. The Windows CIFS client will attempt a poor-man's
pre-allocation of the file on the server by sending 1-byte writes at
128K-byte strides, breaking block allocation on ext3 and leading to
fragmentation and poor performance. This will happen for many
applications (including iTunes) as the CIFS client issues these
pre-allocates under the application layer.
This is rather hard to believe so I think some more information is in
order. Specifically, how do you know that it is the windows kernel that
is issuing these writes and not the application? Under what application
access patterns does it do this?
This is just rather hard to believe seeing as how, iirc, the CIFS
protocol has commands to extend the file size properly rather than with
this hack, and unless it is asked to by the application, the cifs client
should not be trying to extend files.
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