Sponsored Content
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
 

9 More Discussions You Might Find Interesting

1. UNIX for Advanced & Expert Users

iostat output what is that mean

Hi all, i have run iostat -em, and get below result. Can i know what is this output meaning, and how to fix that problem. iostat -em ---- errors --- device s/w h/w trn tot sd7 0 1 0 1 sd8 1 1 0 2 sd9 0 1 0 1 sd10 0 ... (2 Replies)
Discussion started by: foongkt5220
2 Replies

2. AIX

Need explanation of 'who -d' output

Can someone tell me what the output of 'who -d' is ? What's causing the process in the list to be there ? What can be done to get rid of / fix those process ? Are those process simple problems, important or urgent onces ? I am asking because while looking for another 'who' option, I... (2 Replies)
Discussion started by: Browser_ice
2 Replies

3. Shell Programming and Scripting

Formatting output from iostat

So I use Cacti for monitoring IO statistics on my servers, now originally I couldnt monitor Multipath deviced servers as they have alot of /dev/sdxx and /dev/emcpowerxx, I have devised a method of trimming them down to just the actual devices but the issue is the output looks like so. # iostat... (0 Replies)
Discussion started by: RiSk
0 Replies

4. Shell Programming and Scripting

finding greatest value in a column using awk from iostat output in linux

Friends, . On linux i have to run iostat command and in each iteration have to print the greatest value in each column. e.g iostat -dt -kx 2 2 | awk ' !/sd/ &&!/%util/ && !/Time/ && !/Linux/ {print $12}' 4.38 0.00 0.00 0.00 What i would like to print is only the... (3 Replies)
Discussion started by: achak01
3 Replies

5. Shell Programming and Scripting

finding greatest value in a column using awk from iostat output in linux

Friends, Need some help. On linux i have to run iostat command and in each iteration have to print the greatest value in each column. e.g iostat -dt -kx 2 2 | awk ' !/sd/ &&!/%util/ && !/Time/ && !/Linux/ {print $12}' 4.38 0.00 0.00 0.00 WHhat i would like to... (15 Replies)
Discussion started by: achak01
15 Replies

6. Filesystems, Disks and Memory

iostat output vs TPC output (array layer)

Hi Guys, I've been having some arguments with my colleagues about one thing. Always my thought was that as as far as disk performance is concern by looking at the output of the iostat command (AIX) you would be able to identify if you have a hot disk and then by moving some files out that disk... (3 Replies)
Discussion started by: arizah
3 Replies

7. Solaris

Unmatched ssd create huge unuseful iostat output

My scheduled collection of statistics is giving very large output because of an high number of ssd device not associated to any disk The iostat -x command is collecting statistics from them and the output is very large. I.g. if a run iostat -x|tail +3|awk '{print $1}'>f0.txt.$$ iostat... (5 Replies)
Discussion started by: sun-mik
5 Replies

8. Solaris

Asvc_t values in iostat output

Noticed that asvc_t values in iostat command outputs are mostly more than 100 in our previous iostat analysis. Also found the following detail from an alternate site IO Bottleneck - Disk performance issue - UnixArena ---- 1. asvc_t average service time of active transactions, in... (2 Replies)
Discussion started by: saraperu
2 Replies

9. Shell Programming and Scripting

Need help to parse iostat command output

Hi, I got the code below is one of the threads from this forum. lineCount=$(iostat | wc -l) numDevices=$(expr $lineCount - 7); iostat $interval -x -t | awk -v awkCpuFile=$cpuFile -v awkDeviceFile=$deviceFile -v awkNumDevices=$numDevices ' BEGIN { print... (2 Replies)
Discussion started by: gopivallabha
2 Replies
plimit(1)                                                          User Commands                                                         plimit(1)

NAME
plimit - get or set the resource limits of running processes SYNOPSIS
plimit [-km] pid... plimit {-cdfnstv} soft,hard... pid... DESCRIPTION
If one or more of the cdfnstv options is specified, plimit sets the soft (current) limit and/or the hard (maximum) limit of the indicated resource(s) in the processes identified by the process-ID list, pid. Otherwise plimit reports the resource limits of the processes identi- fied by the process-ID list, pid. Only the owner of a process or the super-user is permitted either to get or to set the resource limits of a process. Only the super-user can increase the hard limit. OPTIONS
The following options are supported: -k On output, show file sizes in kilobytes (1024 bytes) rather than in 512-byte blocks. -m On output, show file and memory sizes in megabytes (1024*1024 bytes). The remainder of the options are used to change specified resource limits. They each accept an argument of the form: soft,hard where soft specifies the soft (current) limit and hard specifies the hard (maximum) limit. If the hard limit is not specified, the comma may be omitted. If the soft limit is an empty string, only the hard limit is set. Each limit is either the literal string unlimited, or a number, with an optional scaling factor, as follows: nk n kilobytes nm n megabytes (minutes for CPU time) nh n hours (for CPU time only) mm:ss minutes and seconds (for CPU time only) The soft limit cannot exceed the hard limit. -c soft,hard Set core file size limits (default unit is 512-byte blocks). -d soft,hard Set data segment (heap) size limits (default unit is kilobytes). -f soft,hard Set file size limits (default unit is 512-byte blocks). -n soft,hard Set file descriptor limits (no default unit). -s soft,hard Set stack segment size limits (default unit is kilobytes). -t soft,hard Set CPU time limits (default unit is seconds). -v soft,hard Set virtual memory size limits (default unit is kilobytes). OPERANDS
The following operands are supported. pid Process ID list. EXIT STATUS
plimit returns the exit value zero on success, non-zero on failure (such as no such process, permission denied, or invalid option). FILES
/proc/pid/* process information and control files ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Availability |SUNWesu | +-----------------------------+-----------------------------+ SEE ALSO
ulimit(1), proc(1), getrlimit(2), setrlimit(2), proc(4), attributes(5), SunOS 5.10 8 Jun 1998 plimit(1)
All times are GMT -4. The time now is 04:59 AM.
Unix & Linux Forums Content Copyright 1993-2022. All Rights Reserved.
Privacy Policy