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da0697bd30
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>
30 lines
1.5 KiB
Plaintext
30 lines
1.5 KiB
Plaintext
What: /sys/class/scsi_host/hostX/isci_id
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Date: June 2011
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Contact: Dave Jiang <dave.jiang@intel.com>
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Description:
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This file contains the enumerated host ID for the Intel
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SCU controller. The Intel(R) C600 Series Chipset SATA/SAS
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Storage Control Unit embeds up to two 4-port controllers in
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a single PCI device. The controllers are enumerated in order
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which usually means the lowest number scsi_host corresponds
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with the first controller, but this association is not
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guaranteed. The 'isci_id' attribute unambiguously identifies
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the controller index: '0' for the first controller,
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'1' for the second.
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What: /sys/class/scsi_host/hostX/acciopath_status
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Date: November 2013
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Contact: Stephen M. Cameron <scameron@beardog.cce.hp.com>
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Description: This file contains the current status of the "SSD Smart Path"
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feature of HP Smart Array RAID controllers using the hpsa
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driver. SSD Smart Path, when enabled permits the driver to
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send i/o requests directly to physical devices that are part
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of a logical drive, bypassing the controllers firmware RAID
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stack for a performance advantage when possible. A value of
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'1' indicates the feature is enabled, and the controller may
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use the direct i/o path to physical devices. A value of zero
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means the feature is disabled and the controller may not use
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the direct i/o path to physical devices. This setting is
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controller wide, affecting all configured logical drives on the
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controller. This file is readable and writable.
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