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read_ahead_kb
2012 Oct 07
0
rsync patch
...nd timeouts
are retried by the kernel six times, so without adjusting the SCSI
command timeout rsync (or anything in userspace) will be waiting three
minutes after each error. Five seconds is long enough to exceed the
USB bus reset cycle. Additionally, it is probably wise to set
nr_requests to 1, readahead_kb to 0 and nomerges to 1 for the affected
drive.
Feedback on the patch is appreciated.
Sincerely,
Steve Thompson