unix and linux commands - unix shell scripting

Shouting at hard disks


 
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Old 01-09-2009
Shouting at hard disks

Shhh, be wewwy, wewwy, quiet!  We'we hunting disk latency.  Who knew that yelling at your hard disks, far from getting them to work faster, would only make things worse?  Well, when you think about it in terms of vibration, it makes a lot of sense.

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diskscan(1M)						  System Administration Commands					      diskscan(1M)

NAME
diskscan - perform surface analysis SYNOPSIS
diskscan [-W] [-n] [-y] raw_device DESCRIPTION
diskscan is used by the system administrator to perform surface analysis on a portion of a hard disk. The disk portion may be a raw parti- tion or slice; it is identified using its raw device name. By default, the specified portion of the disk is read (non-destructive) and errors reported on standard error. In addition, a progress report is printed on standard out. The list of bad blocks should be saved in a file and later fed into addbadsec(1M), which will remap them. OPTIONS
The following options are supported: -n Causes diskscan to suppress linefeeds when printing progress information on standard out. -W Causes diskscan to perform write and read surface analysis. This type of surface analysis is destructive and should be invoked with caution. -y Causes diskscan to suppress the warning regarding destruction of existing data that is issued when -W is used. OPERANDS
The following operands are supported: raw_device The address of the disk drive (see FILES). FILES
The raw device should be /dev/rdsk/c?[t?]d?[ps]?. See disks(1M) for an explanation of SCSI and IDE device naming conventions. ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Architecture |x86 | +-----------------------------+-----------------------------+ |Availability |SUNWcsu | +-----------------------------+-----------------------------+ SEE ALSO
addbadsec(1M), disks(1M), fdisk(1M), fmthard(1M), format(1M), attributes(5) NOTES
The format(1M) utility is available to format, label, analyze, and repair SCSI disks. This utility is included with the diskscan, addbad- sec(1M), fdisk(1M), and fmthard(1M) commands available for x86. To format an IDE disk, use the DOS format utility; however, to label, ana- lyze, or repair IDE disks on x86 systems, use the Solaris format(1M) utility. SunOS 5.10 24 Feb 1998 diskscan(1M)