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Special Forums Hardware checking non sequential reading/writing of hard drive Post 302563285 by jim mcnamara on Monday 10th of October 2011 05:14:20 PM
Old 10-10-2011
we need way more information.

What problem - exactly - are you trying to solve? Please tell us what you are trying to work on, not what you think the solution is. Pls -- what unix are you using?

The answer to your question as posed is not going to help you: depending on hardware, you probably need to log average seek times over long periods of operation, then look at the logs to see what seek times are like during the time of your problem, if there is one. Some controllers maintain information like that, for example some SCSI controllers. Special software (usually from the manufacturer ) lets you see data like that. There may also be some ioctl queries that can help.

Generally lots of seeks can slow down I/O, depending on what the application is doing that defeats the effect of caching.
 

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volcheck(1)							   User Commands						       volcheck(1)

NAME
volcheck - checks for media in a drive and by default checks all floppy media SYNOPSIS
volcheck [-v] [-i secs] [-t secs] pathname DESCRIPTION
The volcheck utility tells Volume Management to look at each dev/pathname in sequence and determine if new media has been inserted in the drive. The default action is to volcheck all checkable media managed by volume management. OPTIONS
The following options are supported: -i secs Set the frequency of device checking to secs seconds. The default is 2 seconds. The minimum frequency is 1 second. -t secs Check the named device(s) for the next secs seconds. The maximum number of seconds allowed is 28800, which is 8 hours. The fre- quency of checking is specified by -i. There is no default total time. -v Verbose. OPERANDS
The following operands are supported: pathname The path name of a media device. EXAMPLES
Example 1: A sample of the volcheck command. The following example example% volcheck -v /dev/diskette /dev/diskette has media asks Volume Management to examine the floppy drive for new media. The following example example% volcheck -i 2 -t 600 /dev/diskette1 & asks Volume Management if there is a floppy in the floppy drive every 2 seconds for 600 seconds (10 minutes). FILES
/dev/volctl Volume Management control port ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Availability |SUNWvolu | +-----------------------------+-----------------------------+ SEE ALSO
eject(1), volcancel(1), volmissing(1) rmmount(1M), vold(1M), rmmount.conf(4), vold.conf(4), attributes(5), volfs(7FS) WARNINGS
Due to a hardware limitation in many floppy drives, the act of checking for media causes mechanical action in the floppy drive. Continu- ous polling of the floppy drive will cause the drive to wear out. It is recommended that polling the drive only be performed during periods of high use. SunOS 5.10 21 Feb 1997 volcheck(1)
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