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992ebcf1 SC |
1 | |
2 | HPSA - Hewlett Packard Smart Array driver | |
3 | ----------------------------------------- | |
4 | ||
5 | This file describes the hpsa SCSI driver for HP Smart Array controllers. | |
6 | The hpsa driver is intended to supplant the cciss driver for newer | |
7 | Smart Array controllers. The hpsa driver is a SCSI driver, while the | |
8 | cciss driver is a "block" driver. Actually cciss is both a block | |
9 | driver (for logical drives) AND a SCSI driver (for tape drives). This | |
10 | "split-brained" design of the cciss driver is a source of excess | |
11 | complexity and eliminating that complexity is one of the reasons | |
12 | for hpsa to exist. | |
13 | ||
14 | Supported devices: | |
15 | ------------------ | |
16 | ||
17 | Smart Array P212 | |
18 | Smart Array P410 | |
19 | Smart Array P410i | |
20 | Smart Array P411 | |
21 | Smart Array P812 | |
22 | Smart Array P712m | |
23 | Smart Array P711m | |
24 | StorageWorks P1210m | |
25 | ||
26 | Additionally, older Smart Arrays may work with the hpsa driver if the kernel | |
27 | boot parameter "hpsa_allow_any=1" is specified, however these are not tested | |
28 | nor supported by HP with this driver. For older Smart Arrays, the cciss | |
29 | driver should still be used. | |
30 | ||
02ec19c8 SC |
31 | The "hpsa_simple_mode=1" boot parameter may be used to prevent the driver from |
32 | putting the controller into "performant" mode. The difference is that with simple | |
33 | mode, each command completion requires an interrupt, while with "performant mode" | |
34 | (the default, and ordinarily better performing) it is possible to have multiple | |
35 | command completions indicated by a single interrupt. | |
36 | ||
992ebcf1 SC |
37 | HPSA specific entries in /sys |
38 | ----------------------------- | |
39 | ||
40 | In addition to the generic SCSI attributes available in /sys, hpsa supports | |
41 | the following attributes: | |
42 | ||
43 | HPSA specific host attributes: | |
44 | ------------------------------ | |
45 | ||
46 | /sys/class/scsi_host/host*/rescan | |
d28ce020 | 47 | /sys/class/scsi_host/host*/firmware_revision |
941b1cda | 48 | /sys/class/scsi_host/host*/resettable |
745a7a25 | 49 | /sys/class/scsi_host/host*/transport_mode |
992ebcf1 SC |
50 | |
51 | the host "rescan" attribute is a write only attribute. Writing to this | |
52 | attribute will cause the driver to scan for new, changed, or removed devices | |
53 | (e.g. hot-plugged tape drives, or newly configured or deleted logical drives, | |
54 | etc.) and notify the SCSI midlayer of any changes detected. Normally this is | |
55 | triggered automatically by HP's Array Configuration Utility (either the GUI or | |
56 | command line variety) so for logical drive changes, the user should not | |
57 | normally have to use this. It may be useful when hot plugging devices like | |
58 | tape drives, or entire storage boxes containing pre-configured logical drives. | |
59 | ||
d28ce020 SC |
60 | The "firmware_revision" attribute contains the firmware version of the Smart Array. |
61 | For example: | |
62 | ||
63 | root@host:/sys/class/scsi_host/host4# cat firmware_revision | |
64 | 7.14 | |
65 | ||
745a7a25 SC |
66 | The transport_mode indicates whether the controller is in "performant" |
67 | or "simple" mode. This is controlled by the "hpsa_simple_mode" module | |
68 | parameter. | |
69 | ||
941b1cda SC |
70 | The "resettable" read-only attribute indicates whether a particular |
71 | controller is able to honor the "reset_devices" kernel parameter. If the | |
72 | device is resettable, this file will contain a "1", otherwise, a "0". This | |
73 | parameter is used by kdump, for example, to reset the controller at driver | |
74 | load time to eliminate any outstanding commands on the controller and get the | |
75 | controller into a known state so that the kdump initiated i/o will work right | |
76 | and not be disrupted in any way by stale commands or other stale state | |
77 | remaining on the controller from the previous kernel. This attribute enables | |
78 | kexec tools to warn the user if they attempt to designate a device which is | |
79 | unable to honor the reset_devices kernel parameter as a dump device. | |
80 | ||
992ebcf1 SC |
81 | HPSA specific disk attributes: |
82 | ------------------------------ | |
83 | ||
84 | /sys/class/scsi_disk/c:b:t:l/device/unique_id | |
85 | /sys/class/scsi_disk/c:b:t:l/device/raid_level | |
86 | /sys/class/scsi_disk/c:b:t:l/device/lunid | |
87 | ||
88 | (where c:b:t:l are the controller, bus, target and lun of the device) | |
89 | ||
90 | For example: | |
91 | ||
92 | root@host:/sys/class/scsi_disk/4:0:0:0/device# cat unique_id | |
93 | 600508B1001044395355323037570F77 | |
94 | root@host:/sys/class/scsi_disk/4:0:0:0/device# cat lunid | |
95 | 0x0000004000000000 | |
96 | root@host:/sys/class/scsi_disk/4:0:0:0/device# cat raid_level | |
97 | RAID 0 | |
98 | ||
99 | HPSA specific ioctls: | |
100 | --------------------- | |
101 | ||
102 | For compatibility with applications written for the cciss driver, many, but | |
103 | not all of the ioctls supported by the cciss driver are also supported by the | |
104 | hpsa driver. The data structures used by these are described in | |
105 | include/linux/cciss_ioctl.h | |
106 | ||
107 | CCISS_DEREGDISK | |
108 | CCISS_REGNEWDISK | |
109 | CCISS_REGNEWD | |
110 | ||
111 | The above three ioctls all do exactly the same thing, which is to cause the driver | |
112 | to rescan for new devices. This does exactly the same thing as writing to the | |
113 | hpsa specific host "rescan" attribute. | |
114 | ||
115 | CCISS_GETPCIINFO | |
116 | ||
117 | Returns PCI domain, bus, device and function and "board ID" (PCI subsystem ID). | |
118 | ||
119 | CCISS_GETDRIVVER | |
120 | ||
121 | Returns driver version in three bytes encoded as: | |
122 | (major_version << 16) | (minor_version << 8) | (subminor_version) | |
123 | ||
124 | CCISS_PASSTHRU | |
125 | CCISS_BIG_PASSTHRU | |
126 | ||
127 | Allows "BMIC" and "CISS" commands to be passed through to the Smart Array. | |
128 | These are used extensively by the HP Array Configuration Utility, SNMP storage | |
129 | agents, etc. See cciss_vol_status at http://cciss.sf.net for some examples. | |
130 |