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ssd(7D) Devices SunOS 5.5

NAME ssd − driver for SPARCstorage Array disk devices

SYNOPSIS ssd@port,target:partition

DESCRIPTION This driver handlesSCSI-2 disks in the SPARCstorage Array.

The SPARCstorage Array currently supports ﬁxed media disk drives. The speciﬁc type

of each disk in the SPARCstorage Array is determined by the SCSI inquiry command and

reading the volume label stored on block 0 of the drive. The volume label describes the

disk geometry and partitioning;it must be present or the disk cannot be mounted by the

system.

The block-ﬁles access the disk using the system’s normal buffering mechanism and are

read and written without regard to physical disk records. There is also a “raw” interface

that provides for direct transmission between the disk and the user’s read or write buffer.

A single read or write call usually results in one I/O operation; raw I/O is therefore con-

siderably more efﬁcient when many bytes are transmitted. The names of the block ﬁles

are found in /dev/dsk; the names of the raw ﬁles are found in /dev/rdsk.

I/O requests (such as lseek(2)) to the SCSI disk must have an offset that is a multiple of

512 bytes (DEV_BSIZE), or the driver returns anEINVAL error. If the transfer length is not

a multiple of 512 bytes, the transfer count is rounded up by the driver.

Partition 0 is normally used for the root ﬁle system on a disk, partition 1 as a paging area

(for example, swap), and partition 2 for backing up the entire disk. Partition 2 normally

maps the entire disk and may also be used as the mount point for secondary disks in the

system. The rest of the disk is normally partition 6. For the primary disk, the user ﬁle

system is located here.

IOCTLS Refer to dkio(7I).

ERRORS EACCES Permission denied.

EBUSY The partition was opened exclusivelyby another thread.

EFAULT The argument was a bad address.

EINVAL Invalid argument.

EIO An I/O error occurred.

ENOTTY The device does not support the requested ioctl function.

ENXIO When returned during open(2), this error indicates the device does not

exist.

EROFS The device is a read-only device.

FILES ssd.conf driver conﬁguration ﬁle

/dev/dsk/cntndnsn block ﬁles

/dev/rdsk/cntndnsn raw ﬁles

7D-302 modiﬁed 6 Apr 1995

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