Solaris kstat sdX disk nread counter value decreasing

Posted by mykhal on Server Fault See other posts from Server Fault or by mykhal
Published on 2009-12-21T10:25:57Z Indexed on 2011/06/21 0:23 UTC
Read the original article Hit count: 155

Filed under:

solaris

|

disk

I get strange disk io nread (bytes read) counter values (from kstat) on Solaris. Example of collected nread value for sd6 disk collected in 30s interval (command kstat -n sd6):

One would suppose that the relative read bytes count can't be negative.. I wonder what can couse this situation and whether there is more reliable disk io data available.

Some info about the system:

machine:~ # uname -a
SunOS machine 5.10 Generic_127112-11 i86pc i386 i86pc
machine:~ # cat /etc/release 
                        Solaris 10 11/06 s10x_u3wos_10 X86
           Copyright 2006 Sun Microsystems, Inc.  All Rights Reserved.
                        Use is subject to license terms.
                           Assembled 14 November 2006

© Server Fault or respective owner

Related posts about solaris

Solaris 11 Launch Blog Carnival Roundup

as seen on Oracle Blogs - Search for 'Oracle Blogs'
Solaris 11 is here! And together with the official launch activities, a lot of Oracle and non-Oracle bloggers contributed helpful and informative blog articles to help your datacenter go to eleven. Here are some notable blog postings, sorted by category for your Solaris 11 blog-reading pleasure: Getting… >>> More
Solaris OS?????????? (??????·SIer????!??????)

as seen on Oracle Blogs - Search for 'Oracle Blogs'
Solaris11???????????????2011?11??????OS????????11.1??????????2012?11???????????????OTN?Solaris11?????????????????????????????????????OTN?????????????????????????????????????????????????????????????????????IT?????????Solaris??????????????????????????????????????????Solaris???????Solaris 11????????… >>> More
????????????????? Oracle Solaris ??? - Solaris 11 ????(??)

as seen on Oracle Blogs - Search for 'Oracle Blogs'
???????????????? OS ????????????????????? 20 ??????????????????? Solaris?????????????????????? OS????????????????????????Solaris ???????????????????? ??????Oracle Solaris ??????????????6??????????????????Oracle Solaris ?????????????????????? [????????????] ?????(????????????? ???)?????(?… >>> More
????????????????? Oracle Solaris ??? - Solaris 11 ????

as seen on Oracle Blogs - Search for 'Oracle Blogs'
???????????????? OS ????????????????????? 20 ??????????????????? Solaris?????????????????????? OS????????????????????????Solaris ???????????????????? ??????Solaris ?????????????? 4 ????????????????????? Oracle Solaris 11 ??????????????? [????????????]???? ?(????????????? ???)???? ?(?????… >>> More
??????????·????????????Oracle Solaris Cluster 4.0?

as seen on Oracle Blogs - Search for 'Oracle Blogs'
??????OS?Oracle Solaris 11???????????????·????????????Oracle Solaris Cluster 4.0???2011?12?6????????????Oracle Solaris 11 ???????????????????????????Oracle Solaris Cluster 4.0 ???????????????????????? Oracle Solaris Cluster 4.0 ?3?????? - Oracle Solaris Cluster… >>> More

Related posts about disk

?11gR2 RAC???ASM DISK Path????

as seen on Oracle Blogs - Search for 'Oracle Blogs'
????T.askmaclean.com???????11gR2?ASM DISK?????,??????: aix 6.1,grid 11.2.0.3+asm11.2.0.3+rac ???????????aix????????mpio,??diskgroup ?????veritas dmp???,?????asm?disk_strings=/dev/vx/rdmp/*,crs/asm??????????????/dev/vx/rdmp/?????,?????????diskgroup??? crs???????:2012-07-13… >>> More
?11gR2 RAC???ASM DISK Path????

as seen on Oracle Blogs - Search for 'Oracle Blogs'
????T.askmaclean.com???????11gR2?ASM DISK?????,??????: aix 6.1,grid 11.2.0.3+asm11.2.0.3+rac ???????????aix????????mpio,??diskgroup ?????veritas dmp???,?????asm?disk_strings=/dev/vx/rdmp/*,crs/asm??????????????/dev/vx/rdmp/?????,?????????diskgroup??? crs???????:2012-07-13… >>> More
Time machine disk icon on boot disk

as seen on Super User - Search for 'Super User'
The icon for Macintosh HD (my boot disk) shows as a Time Machine disk. There is a file .com.apple.timemachine.supported in the root of the disk. If I delete the file and restart the computer, the icon goes back to a normal HD icon. However, the .com.apple.timemachine.supported file is recreated at… >>> More
Use hard disk image like a regular hard disk on Linux

as seen on Super User - Search for 'Super User'
If you have a hard disk image (including partition table, multiple partitions,...), is it possible to let Linux treat it as a regular hard disk? By "regular hard disk" I mean I would like to have the image show up as, for instance, /dev/hdx and its partitions as /dev/hdx1,... (I know I can mount… >>> More
Windows 7 detects my 1 TB disk as a disk with only 31 MB space

as seen on Super User - Search for 'Super User'
I've added another 1 TB Western Digital disk on my computer (there is a disk with 250 GB already), and after booting to Windows 7, it recognise the disk, but in the Disk Management panel, it says the disk has only 31 MB TOTAL space, so is what it shows in the EVEREST information. And when I rebooted… >>> More