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| author | Stephen M. Cameron <scameron@beardog.cce.hp.com> | 2011-03-10 00:00:06 +0100 |
|---|---|---|
| committer | James Bottomley <James.Bottomley@suse.de> | 2011-03-15 00:44:41 +0100 |
| commit | 941b1cdae83039c99fc5c1884a98d2afd39760e5 (patch) | |
| tree | 050d9853589eb142b9edf292399e574d919c9151 /Documentation | |
| parent | [SCSI] hpsa: move device attributes to avoid forward declarations (diff) | |
| download | linux-941b1cdae83039c99fc5c1884a98d2afd39760e5.tar.xz linux-941b1cdae83039c99fc5c1884a98d2afd39760e5.zip | |
[SCSI] hpsa: export resettable host attribute
This attribute, requested by Redhat, allows kexec-tools to know
whether the controller can honor the reset_devices kernel parameter
and actually reset the controller. For kdump to work properly it
is necessary that the reset_devices parameter be honored. This
attribute enables kexec-tools to warn the user if they attempt to
designate a non-resettable controller as the dump device.
Signed-off-by: Stephen M. Cameron <scameron@beardog.cce.hp.com>
Signed-off-by: James Bottomley <James.Bottomley@suse.de>
Diffstat (limited to 'Documentation')
| -rw-r--r-- | Documentation/scsi/hpsa.txt | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/Documentation/scsi/hpsa.txt b/Documentation/scsi/hpsa.txt index 880c085b951b..891435a72fce 100644 --- a/Documentation/scsi/hpsa.txt +++ b/Documentation/scsi/hpsa.txt @@ -45,6 +45,7 @@ HPSA specific entries in /sys /sys/class/scsi_host/host*/rescan /sys/class/scsi_host/host*/firmware_revision + /sys/class/scsi_host/host*/resettable /sys/class/scsi_host/host*/transport_mode the host "rescan" attribute is a write only attribute. Writing to this @@ -66,6 +67,17 @@ HPSA specific entries in /sys or "simple" mode. This is controlled by the "hpsa_simple_mode" module parameter. + The "resettable" read-only attribute indicates whether a particular + controller is able to honor the "reset_devices" kernel parameter. If the + device is resettable, this file will contain a "1", otherwise, a "0". This + parameter is used by kdump, for example, to reset the controller at driver + load time to eliminate any outstanding commands on the controller and get the + controller into a known state so that the kdump initiated i/o will work right + and not be disrupted in any way by stale commands or other stale state + remaining on the controller from the previous kernel. This attribute enables + kexec tools to warn the user if they attempt to designate a device which is + unable to honor the reset_devices kernel parameter as a dump device. + HPSA specific disk attributes: ------------------------------ |