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authorStephen M. Cameron <scameron@beardog.cce.hp.com>2010-05-27 16:14:29 -0400
committerJames Bottomley <James.Bottomley@suse.de>2010-07-27 13:01:16 -0400
commit992ebcf14f3cf029b8d0da4f479d752c19d8c726 (patch)
tree4f44ec1e8332f89159186b9a2a1d302977b20717 /Documentation
parent873f339fc53750c1e715f5e1d2dfdb9869b7ea3f (diff)
[SCSI] hpsa: Add hpsa.txt to Documentation/scsi
Signed-off-by: Stephen M. Cameron <scameron@beardog.cce.hp.com> Signed-off-by: James Bottomley <James.Bottomley@suse.de>
Diffstat (limited to 'Documentation')
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1
2HPSA - Hewlett Packard Smart Array driver
3-----------------------------------------
4
5This file describes the hpsa SCSI driver for HP Smart Array controllers.
6The hpsa driver is intended to supplant the cciss driver for newer
7Smart Array controllers. The hpsa driver is a SCSI driver, while the
8cciss driver is a "block" driver. Actually cciss is both a block
9driver (for logical drives) AND a SCSI driver (for tape drives). This
10"split-brained" design of the cciss driver is a source of excess
11complexity and eliminating that complexity is one of the reasons
12for hpsa to exist.
13
14Supported devices:
15------------------
16
17Smart Array P212
18Smart Array P410
19Smart Array P410i
20Smart Array P411
21Smart Array P812
22Smart Array P712m
23Smart Array P711m
24StorageWorks P1210m
25
26Additionally, older Smart Arrays may work with the hpsa driver if the kernel
27boot parameter "hpsa_allow_any=1" is specified, however these are not tested
28nor supported by HP with this driver. For older Smart Arrays, the cciss
29driver should still be used.
30
31HPSA specific entries in /sys
32-----------------------------
33
34 In addition to the generic SCSI attributes available in /sys, hpsa supports
35 the following attributes:
36
37 HPSA specific host attributes:
38 ------------------------------
39
40 /sys/class/scsi_host/host*/rescan
41
42 the host "rescan" attribute is a write only attribute. Writing to this
43 attribute will cause the driver to scan for new, changed, or removed devices
44 (e.g. hot-plugged tape drives, or newly configured or deleted logical drives,
45 etc.) and notify the SCSI midlayer of any changes detected. Normally this is
46 triggered automatically by HP's Array Configuration Utility (either the GUI or
47 command line variety) so for logical drive changes, the user should not
48 normally have to use this. It may be useful when hot plugging devices like
49 tape drives, or entire storage boxes containing pre-configured logical drives.
50
51 HPSA specific disk attributes:
52 ------------------------------
53
54 /sys/class/scsi_disk/c:b:t:l/device/unique_id
55 /sys/class/scsi_disk/c:b:t:l/device/raid_level
56 /sys/class/scsi_disk/c:b:t:l/device/lunid
57
58 (where c:b:t:l are the controller, bus, target and lun of the device)
59
60 For example:
61
62 root@host:/sys/class/scsi_disk/4:0:0:0/device# cat unique_id
63 600508B1001044395355323037570F77
64 root@host:/sys/class/scsi_disk/4:0:0:0/device# cat lunid
65 0x0000004000000000
66 root@host:/sys/class/scsi_disk/4:0:0:0/device# cat raid_level
67 RAID 0
68
69HPSA specific ioctls:
70---------------------
71
72 For compatibility with applications written for the cciss driver, many, but
73 not all of the ioctls supported by the cciss driver are also supported by the
74 hpsa driver. The data structures used by these are described in
75 include/linux/cciss_ioctl.h
76
77 CCISS_DEREGDISK
78 CCISS_REGNEWDISK
79 CCISS_REGNEWD
80
81 The above three ioctls all do exactly the same thing, which is to cause the driver
82 to rescan for new devices. This does exactly the same thing as writing to the
83 hpsa specific host "rescan" attribute.
84
85 CCISS_GETPCIINFO
86
87 Returns PCI domain, bus, device and function and "board ID" (PCI subsystem ID).
88
89 CCISS_GETDRIVVER
90
91 Returns driver version in three bytes encoded as:
92 (major_version << 16) | (minor_version << 8) | (subminor_version)
93
94 CCISS_PASSTHRU
95 CCISS_BIG_PASSTHRU
96
97 Allows "BMIC" and "CISS" commands to be passed through to the Smart Array.
98 These are used extensively by the HP Array Configuration Utility, SNMP storage
99 agents, etc. See cciss_vol_status at http://cciss.sf.net for some examples.
100