1dad(7D) Devices dad(7D)
2
6 dad - driver for IDE disk devices
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9 dad@ target,lun:partition
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13 This driver handles the ide disk drives on SPARC platforms. The type of
14 disk drive is determined using the ATA IDE identify device command and
15 by reading the volume label stored on the drive. The dad device driver
16 supports the Solaris SPARC VTOC and the EFI/GPT disk volume labels.
17 The block-files access the disk using the system's normal buffering
20 mechanism and are read and written without regard to physical disk
21 records. There is also a "raw" interface that provides for direct
22 transmission between the disk and the user's read or write buffer. A
23 single read or write call usually results in one I/O operation; raw I/O
24 is therefore considerably more efficient when many bytes are transmit‐
25 ted. The names of the block files are found in /dev/dsk. Raw file
26 names are found in /dev/rdsk.
27 I/O requests to the raw device must be aligned on a 512-byte
30 (DEV_BSIZE) boundary and must have a length that is a multiple of 512
31 bytes. Requests that do not meet the restrictions cause the driver to
32 return an EINVAL error. I/O requests to the block device have no align‐
33 ment or length restrictions.
34 Device Statistics Support
36 Each device maintains I/O statistics both for the device and for each
37 partition allocated on that device. For each device/partition, the
38 driver accumulates reads, writes, bytes read, and bytes written. The
39 driver also takes hi-resolution time stamps at queue entry and exit
40 points, which facilitates monitoring the residence time and cumulative
41 residence-length product for each queue.
42 Each device also has error statistics associated with it. These must
45 include counters for hard errors, soft errors and transport errors.
46 Other data may be implemented as required.
47
49 /dev/dsk/cntndnsn block files
50 /dev/rdsk/cntndnsn raw files
53 where:
57 cn controller n
59 tn IDE target id n (0-3)
62 dn Always 0.
65 sn partition n (0-7)
68 The target ide numbers are assigned as:
72 0 Master disk on Primary channel.
74 1 Slave disk on Primary channel.
77 2 Master disk on Secondary channel
80 3 Slave disk on Secondary channel.
83
86 Refer to dkio(7I).
87
89 EACCES Permission denied.
90 EBUSY The partition was opened exclusively by another thread.
93 EFAULT Argument was a bad address.
96 EINVAL Invalid argument.
99 EIO I/O error occurred.
102 ENOTTY The device does not support the requested ioctl function.
105 ENXIO The device did not exist during opening.
108 EROFS The device is a read-only device.
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114 format(1M), mount(1M), lseek(2), read(2), write(2), driver.conf(4),
115 vfstab(4), dkio(7I)
116 X3T10 ATA-4 specifications.
119
121 Command:<number>, Error:<number>, Status:<number>
122 Indicates that the command failed with an error and provides status
124 register contents. Where <number> is a hexadecimal value.
125 offline
128 The driver has decided that the target disk is no longer there.
130 disk ok
133 The target disk is now responding again.
135 disk not responding to selection
138 The target disk is not responding.
140 i/o to invalid geometry
143 The geometry of the drive could not be established.
145 incomplete read/write - retrying/giving up
148 There was a residue after the command completed normally.
150 no bp for disk label
153 A bp with consistent memory could not be allocated.
155 no memory for disk label
158 Free memory pool exhausted.
160 ATA transport failed: reason 'nnnn': {retrying|giving}
163 The host adapter has failed to transport a command to the target
165 for the reason stated. The driver will either retry the command or,
166 ultimately, give up.
167 no mem for property
170 Free memory pool exhausted.
172 transport rejected (<n>)
175 Host adapter driver was unable to accept a command.
177 Device Fault
180 Device fault - reason for such error is vendor specific.
182SunOS 5.11 24 Oct 2005 dad(7D)