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| author |   Chandra Seetharaman <sekharan@us.ibm.com> | 2009-10-21 09:22:51 -0700 |
|---|---|---|
| committer |   James Bottomley <James.Bottomley@suse.de> | 2009-12-04 12:00:47 -0600 |
| commit | 970f3f47e7c97c0bfe9f91356943b55ac389cb1d (patch) | |
| tree | dab9946544c452937d165239df74d667d16bddf9 /drivers/scsi/device_handler/scsi_dh_hp_sw.c | |
| parent | [SCSI] scsi_dh: Change the scsidh_activate interface to be asynchronous (diff) | |
| download | linux-dev-970f3f47e7c97c0bfe9f91356943b55ac389cb1d.tar.xz linux-dev-970f3f47e7c97c0bfe9f91356943b55ac389cb1d.zip | |
[SCSI] scsi_dh: Make rdac hardware handler's activate() async
Batch up MODE_SELECT in rdac device handler.
LSI RDAC storage has the capability of handling mode selects for
multiple luns in a same command. Make use of that ability to send
as few MODE SELECTs as possible to the storage controller as possible.
This patch creates a work queue and queues up activate requests
when a MODE SELECT is sent down the wire. When that MODE SELECT
completes, it compiles queued up activate requests for multiple
luns into a single MODE SELECT.
This reduces the time to do failover/failback of large number of LUNS.
Signed-off-by: Babu Moger <babu.moger@lsi.com>
Signed-off-by: Chandra Seetharaman <sekharan@us.ibm.com>
Signed-off-by: James Bottomley <James.Bottomley@suse.de>
Diffstat (limited to '')
0 files changed, 0 insertions, 0 deletions