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author | Chandra Seetharaman <sekharan@us.ibm.com> | 2011-01-13 20:00:01 +0000 |
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committer | Alasdair G Kergon <agk@redhat.com> | 2011-01-13 20:00:01 +0000 |
commit | 4e2d19e46b507018c6ed15f6c081d8f887ae229c (patch) | |
tree | c4004056ca62763c87e5dae1c19d7e22877ec571 /include | |
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 <knikanth@suse.de>
Signed-off-by: Chandra Seetharaman <sekharan@us.ibm.com>
Acked-by: Mike Christie <michaelc@cs.wisc.edu>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Signed-off-by: Alasdair G Kergon <agk@redhat.com>
Diffstat (limited to 'include')
0 files changed, 0 insertions, 0 deletions