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| author |   Scott Teel <scott.teel@hp.com> | 2014-02-18 13:57:00 -0600 |
|---|---|---|
| committer |   James Bottomley <JBottomley@Parallels.com> | 2014-03-15 10:19:07 -0700 |
| commit | da0697bd3075598f7990002dc46f208d722b6160 (patch) | |
| tree | 64682fc16ed80050cf60c4f116384cb649502e44 /Documentation/ABI/testing/sysfs-class-scsi_host | |
| parent | [SCSI] hpsa: complete the ioaccel raidmap code (diff) | |
| download | linux-dev-da0697bd3075598f7990002dc46f208d722b6160.tar.xz linux-dev-da0697bd3075598f7990002dc46f208d722b6160.zip | |
[SCSI] hpsa: allow user to disable accelerated i/o path
Allow SSD Smart Path for a controller to be disabled by
the user, regardless of settings in controller firmware
or array configuration.
To disable: echo 0 > /sys/class/scsi_host/host<id>/acciopath_status
To re-enable: echo 1 > /sys/class/scsi_host/host<id>/acciopath_status
To check state: cat /sys/class/scsi_host/host<id>/acciopath_status
Signed-off-by: Scott Teel <scott.teel@hp.com>
Signed-off-by: Stephen M. Cameron <scameron@beardog.cce.hp.com>
Signed-off-by: James Bottomley <JBottomley@Parallels.com>
Diffstat (limited to 'Documentation/ABI/testing/sysfs-class-scsi_host')
| -rw-r--r-- | Documentation/ABI/testing/sysfs-class-scsi_host | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/Documentation/ABI/testing/sysfs-class-scsi_host b/Documentation/ABI/testing/sysfs-class-scsi_host index 29a4f892e433..0eb255e7db12 100644 --- a/Documentation/ABI/testing/sysfs-class-scsi_host +++ b/Documentation/ABI/testing/sysfs-class-scsi_host @@ -11,3 +11,19 @@ Description: guaranteed. The 'isci_id' attribute unambiguously identifies the controller index: '0' for the first controller, '1' for the second. + +What: /sys/class/scsi_host/hostX/acciopath_status +Date: November 2013 +Contact: Stephen M. Cameron <scameron@beardog.cce.hp.com> +Description: This file contains the current status of the "SSD Smart Path" + feature of HP Smart Array RAID controllers using the hpsa + driver. SSD Smart Path, when enabled permits the driver to + send i/o requests directly to physical devices that are part + of a logical drive, bypassing the controllers firmware RAID + stack for a performance advantage when possible. A value of + '1' indicates the feature is enabled, and the controller may + use the direct i/o path to physical devices. A value of zero + means the feature is disabled and the controller may not use + the direct i/o path to physical devices. This setting is + controller wide, affecting all configured logical drives on the + controller. This file is readable and writable. |