Bug 144649
| Summary: | /proc/stat does not provide the disk_io details for RAID Disk or external disk array | ||
|---|---|---|---|
| Product: | Red Hat Enterprise Linux 3 | Reporter: | Yogesh <myogesh> |
| Component: | kernel | Assignee: | Tom Coughlan <coughlan> |
| Status: | CLOSED NOTABUG | QA Contact: | Brian Brock <bbrock> |
| Severity: | medium | Docs Contact: | |
| Priority: | medium | ||
| Version: | 3.0 | CC: | nhorman, petrides, tao |
| Target Milestone: | --- | ||
| Target Release: | --- | ||
| Hardware: | i386 | ||
| OS: | Linux | ||
| Whiteboard: | |||
| Fixed In Version: | Doc Type: | Bug Fix | |
| Doc Text: | Story Points: | --- | |
| Clone Of: | Environment: | ||
| Last Closed: | 2005-01-25 18:38:51 UTC | Type: | --- |
| Regression: | --- | Mount Type: | --- |
| Documentation: | --- | CRM: | |
| Verified Versions: | Category: | --- | |
| oVirt Team: | --- | RHEL 7.3 requirements from Atomic Host: | |
| Cloudforms Team: | --- | Target Upstream Version: | |
| Embargoed: | |||
Hi Gary,
Thanks for the reply.
We tried with new sysstat package sysstat-5.0.5-2.i386.rpm but this
still does not resolve the issue of /proc/stat where the disk_io
values for the disk array is not displayed . We tried this on our
client place and also on our lab and this was not succesfull.
Let me explain how this can be easily be reproduced.
1. On any X86 box running the below version of RH on IDE hardisk.
[root@root]# cat /etc/redhat-release
Red Hat Enterprise Linux WS release 3 (Taroon Update 1)
[root@root]# uname -a
Linux abhilash 2.4.21-9.EL #1 Thu Jan 8 17:24:12 EST 2004 i686 i686
i386 GNU/Linux
2. Please boot the IDE harddisk as secondary master instead of
primary master . Under this environment please check the disk_io value
in /proc/stat
[root@root]# cat /proc/stat
cpu 741 0 982 1637620 1171 1814 388
cpu0 741 0 982 1637620 1171 1814 388
page 35434 17072
swap 1 0
intr 3364141 1642716 28 0 0 3 0 6 0 1 0 0 1715412 144 0 0 5831
disk_io:
ctxt 1971493
btime 1106034798
processes 3503
procs_running 1
procs_blocked 0
The disk_io does not return any value however the same work fine if
the IDE disk is booted as the primary master . I have pasted the below
details to help you .
root@tmp]# rpm -q sysstat
sysstat-5.0.5-5.rhel3
[root@ tmp]# df -k
Filesystem 1K-blocks Used Available Use% Mounted on
/dev/hdc2 9384708 2730508 6177472 31% /
/dev/hdc1 101089 9200 86670 10% /boot
none 126612 0 126612 0% /dev/shm
[root@tmp]# iostat
Linux 2.4.21-9.EL 01/18/2005
avg-cpu: %user %nice %sys %iowait %idle
0.05 0.00 0.19 0.08 99.68
Device: tps Blk_read/s Blk_wrtn/s Blk_read Blk_wrtn
hdc 0.38 4.57 2.37 76254 39474
hdc1 0.00 0.01 0.00 180 18
hdc2 0.37 4.53 2.37 75482 39456
hdc3 0.00 0.01 0.00 168 0
This issue is very critical since our application uses the disk_io
value to monitor the disk perfomance on RH Enterprise server and due
to this issue we are unable to monitor the disk of our critical
customers who are running RH AS 3.0 .
Thanks
Yogesh
This isn't a bug, its a limitation of the /proc/stat file and the data structures which hold the information presented in it. Due to ABI compatibility issues, it is impossible in the RHEL3 series to add any stats to /proc/partitions for devices with block major > 16. Instead, /proc/partitions has all the current information in /proc/stat (only in a slightly different format), and includes the missing devices. |
From Bugzilla Helper: User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.0; en-US; rv:1.7.5) Gecko/20041107 Firefox/1.0 Description of problem: In RH 3.0 release we found that though the iostat cmd does list the device with the rpm sysstat-4.0.7-4.EL3.3.i386.rpm but disk_io data is not available in the /proc/stat file for the same device # cat /etc/redhat-release Red Hat Enterprise Linux WS release 3 (Taroon Update 1) # uname -a Linux 2.4.21-9.EL #1 Thu Jan 8 17:24:12 EST 2004 i686 i686 i386 GNU/Linux # more /proc/stat cpu 949 0 922 70463 2266 34 5 cpu0 949 0 922 70463 2266 34 5 page 74317 15850 swap 1 0 intr 89550 74639 6 0 0 3 0 5 0 1 0 0 6040 58 0 0 8798 disk_io: ctxt 120629 btime 1096020969 processes 3654 procs_running 1 procs_blocked 0 The output of regular /proc/stat of working linux box root@kalinga root]# cat /proc/stat cpu 432515 682 115963 309681498 87926 5174 120597 cpu0 128265 55 35422 77383474 27514 4255 32229 cpu1 92950 272 26783 77445157 16701 447 28737 cpu2 120714 69 27533 77405447 27210 472 29602 cpu3 90586 286 26225 77447420 16501 0 30029 page 323651 3466728 swap 1 0 intr 84739916 77611583 6 0 6 6 0 5 2 1 0 0 0 32 0 477111 0 0 0 30 0 6651134 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 disk_io: (3,0):(481064,45488,645526,435576,6933428) ctxt 106918155 btime 1095245839 processes 70265 procs_running 1 procs_blocked 0 Version-Release number of selected component (if applicable): How reproducible: Always Steps to Reproduce: 1.On a Linux 2.4.21-9.EL #1 Advanced Server try to check the Disk Performance details of a Externally mounted disk like RAID etc 2. The Disk details does not get listed in the /proc/stat 3. Expected Results: The /proc/stat should have details for the disk like disk_io: (3,0):(481064,45488,645526,435576,6933428) Additional info: This was only observed for Raid Array