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| author | Chandra Seetharaman <[email protected]> | 2011-01-13 20:00:01 +0000 |
|---|---|---|
| committer | Alasdair G Kergon <[email protected]> | 2011-01-13 20:00:01 +0000 |
| commit | 4e2d19e46b507018c6ed15f6c081d8f887ae229c (patch) | |
| tree | c4004056ca62763c87e5dae1c19d7e22877ec571 /tools/perf/scripts/python/syscall-counts.py | |
| parent | 052189a2ec956810feefb6a681416c5e6a207646 (diff) | |
dm mpath: delay activate_path retry on SCSI_DH_RETRY
This patch adds a user-configurable 'pg_init_delay_msecs' feature. Use
this feature to specify the number of milliseconds to delay before
retrying scsi_dh_activate, when SCSI_DH_RETRY is returned.
SCSI Device Handlers return SCSI_DH_IMM_RETRY if we could retry
activation immediately and SCSI_DH_RETRY in cases where it is better to
retry after some delay.
Currently we immediately retry scsi_dh_activate irrespective of
SCSI_DH_IMM_RETRY and SCSI_DH_RETRY.
The 'pg_init_delay_msecs' feature may be provided during table create or
load, e.g.:
dmsetup create --table "0 20971520 multipath 3 queue_if_no_path \
pg_init_delay_msecs 2500 ..." mpatha
The default for 'pg_init_delay_msecs' is 2000 milliseconds.
Maximum configurable delay is 60000 milliseconds. Specifying a
'pg_init_delay_msecs' of 0 will cause immediate retry.
Signed-off-by: Nikanth Karthikesan <[email protected]>
Signed-off-by: Chandra Seetharaman <[email protected]>
Acked-by: Mike Christie <[email protected]>
Signed-off-by: Mike Snitzer <[email protected]>
Signed-off-by: Alasdair G Kergon <[email protected]>
Diffstat (limited to 'tools/perf/scripts/python/syscall-counts.py')
0 files changed, 0 insertions, 0 deletions