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| author |   Seymour, Shane M <shane.seymour@hp.com> | 2015-05-06 01:37:20 +0000 |
|---|---|---|
| committer |   James Bottomley <JBottomley@Odin.com> | 2015-06-02 08:03:25 -0700 |
| commit | 05545c92db9637318a98d3d59d400beb819decc7 (patch) | |
| tree | 56c911568dd7dd6507aac24f7c8c90b657f7bda0 /Documentation/scsi/megaraid.txt | |
| parent | target: Minimize SCSI header #include directives (diff) | |
| download | linux-dev-05545c92db9637318a98d3d59d400beb819decc7.tar.xz linux-dev-05545c92db9637318a98d3d59d400beb819decc7.zip | |
st: implement tape statistics
This patch implements tape statistics in the st module via
sysfs. Current no statistics are available for tape I/O and there
is no easy way to reuse the block layer statistics for tape
as tape is a character device and does not have perform I/O in
sector sized chunks (the size of the data written to tape
can change). For tapes we also need extra stats related to
things like tape movement (via other I/O).
There have been multiple end users requesting statistics
including AT&T (and some HP customers who have not given
permission to be named). It is impossible for them
to investigate any issues related to tape performance
in a non-invasive way.
[jejb: eliminate PRId64]
Signed-off-by: Shane Seymour <shane.seymour@hp.com>
Tested-by: Shane Seymour <shane.seymour@hp.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: James Bottomley <JBottomley@Odin.com>
Diffstat (limited to 'Documentation/scsi/megaraid.txt')
0 files changed, 0 insertions, 0 deletions