Stephen M. Cameron | 992ebcf | 2010-05-27 15:14:29 -0500 | [diff] [blame] | 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 | |
Stephen M. Cameron | 02ec19c | 2011-01-06 14:48:29 -0600 | [diff] [blame^] | 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 | |
Stephen M. Cameron | 992ebcf | 2010-05-27 15:14:29 -0500 | [diff] [blame] | 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 |
Stephen M. Cameron | d28ce02 | 2010-05-27 15:14:34 -0500 | [diff] [blame] | 47 | /sys/class/scsi_host/host*/firmware_revision |
Stephen M. Cameron | 992ebcf | 2010-05-27 15:14:29 -0500 | [diff] [blame] | 48 | |
| 49 | the host "rescan" attribute is a write only attribute. Writing to this |
| 50 | attribute will cause the driver to scan for new, changed, or removed devices |
| 51 | (e.g. hot-plugged tape drives, or newly configured or deleted logical drives, |
| 52 | etc.) and notify the SCSI midlayer of any changes detected. Normally this is |
| 53 | triggered automatically by HP's Array Configuration Utility (either the GUI or |
| 54 | command line variety) so for logical drive changes, the user should not |
| 55 | normally have to use this. It may be useful when hot plugging devices like |
| 56 | tape drives, or entire storage boxes containing pre-configured logical drives. |
| 57 | |
Stephen M. Cameron | d28ce02 | 2010-05-27 15:14:34 -0500 | [diff] [blame] | 58 | The "firmware_revision" attribute contains the firmware version of the Smart Array. |
| 59 | For example: |
| 60 | |
| 61 | root@host:/sys/class/scsi_host/host4# cat firmware_revision |
| 62 | 7.14 |
| 63 | |
Stephen M. Cameron | 992ebcf | 2010-05-27 15:14:29 -0500 | [diff] [blame] | 64 | HPSA specific disk attributes: |
| 65 | ------------------------------ |
| 66 | |
| 67 | /sys/class/scsi_disk/c:b:t:l/device/unique_id |
| 68 | /sys/class/scsi_disk/c:b:t:l/device/raid_level |
| 69 | /sys/class/scsi_disk/c:b:t:l/device/lunid |
| 70 | |
| 71 | (where c:b:t:l are the controller, bus, target and lun of the device) |
| 72 | |
| 73 | For example: |
| 74 | |
| 75 | root@host:/sys/class/scsi_disk/4:0:0:0/device# cat unique_id |
| 76 | 600508B1001044395355323037570F77 |
| 77 | root@host:/sys/class/scsi_disk/4:0:0:0/device# cat lunid |
| 78 | 0x0000004000000000 |
| 79 | root@host:/sys/class/scsi_disk/4:0:0:0/device# cat raid_level |
| 80 | RAID 0 |
| 81 | |
| 82 | HPSA specific ioctls: |
| 83 | --------------------- |
| 84 | |
| 85 | For compatibility with applications written for the cciss driver, many, but |
| 86 | not all of the ioctls supported by the cciss driver are also supported by the |
| 87 | hpsa driver. The data structures used by these are described in |
| 88 | include/linux/cciss_ioctl.h |
| 89 | |
| 90 | CCISS_DEREGDISK |
| 91 | CCISS_REGNEWDISK |
| 92 | CCISS_REGNEWD |
| 93 | |
| 94 | The above three ioctls all do exactly the same thing, which is to cause the driver |
| 95 | to rescan for new devices. This does exactly the same thing as writing to the |
| 96 | hpsa specific host "rescan" attribute. |
| 97 | |
| 98 | CCISS_GETPCIINFO |
| 99 | |
| 100 | Returns PCI domain, bus, device and function and "board ID" (PCI subsystem ID). |
| 101 | |
| 102 | CCISS_GETDRIVVER |
| 103 | |
| 104 | Returns driver version in three bytes encoded as: |
| 105 | (major_version << 16) | (minor_version << 8) | (subminor_version) |
| 106 | |
| 107 | CCISS_PASSTHRU |
| 108 | CCISS_BIG_PASSTHRU |
| 109 | |
| 110 | Allows "BMIC" and "CISS" commands to be passed through to the Smart Array. |
| 111 | These are used extensively by the HP Array Configuration Utility, SNMP storage |
| 112 | agents, etc. See cciss_vol_status at http://cciss.sf.net for some examples. |
| 113 | |