path: root/Documentation/scsi
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authorStephen M. Cameron <scameron@beardog.cce.hp.com>2011-03-09 17:00:06 -0600
committerJames Bottomley <James.Bottomley@suse.de>2011-03-14 18:44:41 -0500
commit941b1cdae83039c99fc5c1884a98d2afd39760e5 (patch)
tree050d9853589eb142b9edf292399e574d919c9151 /Documentation/scsi
parent3f5eac3a040a2ea61a575f713aabedecdd23c3f8 (diff)
[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/scsi')
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*/resettable
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
+ 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:

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