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Operating Systems Solaris iostat -e / -E output explanation Post 65244 by scottman on Thursday 3rd of March 2005 08:28:39 PM
Old 03-03-2005
Hammer & Screwdriver iostat -e / -E output explanation

Hi all, hope you are having a nice day, its nice and warm today in Canberra Australia.

iostat -e / -E reports soft and hard errors. Any idea what these are exactly? All I hear are I/O's failing and needing to retry, but no cause as to why they fail.

My SUN guru tells me its our EMC SAN array generating RSCN's or other fibre channle stuff, and the qlogic card then logs back into the fabric, and during that process some I/O has failed. However the iostat errors come up regardless of the EMC san.

I have searched for and read articles, etc, and really found nothing. however one article said the scsi driver doesn't know the disk RPM speed, another saying that SUN array software needs to be turned off.

We have a history with SUNmc causing SAN disk problems by constantly polling the disk for information (which is why we are upgrading it and have turned it off on some servers).

If you have lots of soft errors, are you likely to get a hard error? When you have lots of hard errors (eg, an internal disk is reporting 2400 hard errors with no corresponsing /var/adm/message entries to do with RSCN, scsi, etc) will you end up with track/cylinder errors?

I guess database/application issues will also cause I/O retries just like tcpip.

The number of network output/inpuit/collisions/queues, also do not relate to the iostat -e output.

Many Thanks
take care all
 

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NICE(1) 						    BSD General Commands Manual 						   NICE(1)

NAME
nice -- execute a utility with an altered scheduling priority SYNOPSIS
nice [-n increment] utility [argument ...] DESCRIPTION
nice runs utility at an altered scheduling priority. If an increment is given, it is used; otherwise an increment of 10 is assumed. The super-user can run utilities with priorities higher than normal by using a negative increment. The priority can be adjusted over a range of -20 (the highest) to 20 (the lowest). Available options: -n increment A positive or negative decimal integer used to modify the system scheduling priority of utility. DIAGNOSTICS
The nice utility shall exit with one of the following values: 1-125 An error occurred in the nice utility. 126 The utility was found but could not be invoked. 127 The utility could not be found. Otherwise, the exit status of nice shall be that of utility. COMPATIBILITY
The historic -increment option has been deprecated but is still supported in this implementation. SEE ALSO
csh(1), getpriority(2), setpriority(2), renice(8) STANDARDS
The nice utility conforms to IEEE Std 1003.2-1992 (``POSIX.2''). HISTORY
A nice utility appeared in Version 6 AT&T UNIX. BUGS
nice is built into csh(1) with a slightly different syntax than described here. The form 'nice +10' nices to positive nice, and 'nice -10' can be used by the super-user to give a process more of the processor. BSD
June 6, 1993 BSD
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