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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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IOSTAT(1M)																IOSTAT(1M)

NAME
iostat - report I/O statistics SYNOPSIS
iostat [ option ] ... [ interval [ count ] ] DESCRIPTION
Iostat delves into the system and reports certain statistics kept about input-output activity. Information is kept about up to three dif- ferent disks (RF, RK, RP) and about typewriters. For each disk, IO completions and number of words transferred are counted; for typewrit- ers collectively, the number of input and output characters are counted. Also, each sixtieth of a second, the state of each disk is exam- ined and a tally is made if the disk is active. The tally goes into one of four categories, depending on whether the system is executing in user mode, in `nice' (background) user mode, in system mode, or idle. From all these numbers and from the known transfer rates of the devices it is possible to determine information such as the degree of IO overlap and average seek times for each device. The optional interval argument causes iostat to report once each interval seconds. The first report is for all time since a reboot and each subsequent report is for the last interval only. The optional count argument restricts the number of reports. With no option argument iostat reports for each disk the number of transfers per minute, the milliseconds per average seek, and the mil- liseconds per data transfer exclusive of seek time. It also gives the percentage of time the system has spend in each of the four cate- gories mentioned above. The following options are available: -t Report the number of characters of terminal IO per second as well. -i Report the percentage of time spend in each of the four categories mentioned above, the percentage of time each disk was active (seeking or transferring), the percentage of time any disk was active, and the percentage of time spent in `IO wait:' idle, but with a disk active. -s Report the raw timing information: 32 numbers indicating the percentage of time spent in each of the possible configurations of 4 system states and 8 IO states (3 disks each active or not). -b Report on the usage of IO buffers. FILES
/dev/mem, /unix IOSTAT(1M)
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