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how do i check i/o in server?

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Operating Systems Linux Red Hat how do i check i/o in server?
# 1  
Old 04-08-2010
how do i check i/o in server?
Hello, I am using linux OS. I want to check I/0 performance and CPU load on the server. CPU load can be seen by using TOP command.

How do i check the I/O performance? I want to see which file system is hitting more I/O wait.. How do i see this...

I tried to use iostat?

Quote:
Linux 2.6.9-78.0.13.ELlargesmp (dtdir900 04/08/2010

avg-cpu: %user %nice %sys %iowait %idle
1.20 0.00 0.23 0.31 98.26

Device: tps Blk_read/s Blk_wrtn/s Blk_read Blk_wrtn
cciss/c0d0 3.48 10.53 157.44 147162613 2200819507
cciss/c0d0p1 0.00 0.00 0.00 6138 398
cciss/c0d0p2 3.48 10.52 157.44 147095915 2200819109
cciss/c0d1 0.00 0.04 0.04 627956 608480
cciss/c0d1p1 0.00 0.04 0.04 566972 608480
sda 4.10 275.53 204.92 3851609404 2864467310
sda3 4.10 275.53 204.92 3851608036 2864467310
sdb 2.72 155.63 8.16 2175572408 114112354
sdb3 2.72 155.63 8.16 2175571040 114112354
sdc 9.07 123.96 46.78 1732853508 653883186
sdc3 9.07 123.96 46.78 1732852140 653883186
sdd 8.72 54.53 39.57 762219102 553174900
sdd3 8.72 54.53 39.57 762217734 553174900
sde 5.22 84.08 19.53 1175303442 273033422
sde3 5.22 84.08 19.53 1175302074 273033422
sdf 1.77 151.81 154.67 2122151621 2162138679
sdf3 1.77 151.81 154.67 2122150253 2162138679
sdg 12.64 107.89 78.11 1508234366 1091816162
sdg3 12.64 107.89 78.11 1508232998 1091816162

Above first column is device name? if so, then how can i map the above one with below file system?

Quote:
dtdir900 *xyz899-/home/oracle
>df -h
Filesystem Size Used Avail Use% Mounted on
/dev/mapper/systemvg-rootvol
9.7G 6.3G 2.9G 69% /
tmpfs 4.0K 0 4.0K 0% /dev/vx
tmpfs 4.0K 0 4.0K 0% /dev/vx
/dev/cciss/c0d0p1 251M 24M 215M 10% /boot
none 7.9G 0 7.9G 0% /dev/shm
/dev/mapper/systemvg-oravol
20G 4.6G 14G 25% /ora
/dev/mapper/systemvg-tmpvol
4.9G 66M 4.6G 2% /tmp
/dev/mapper/systemvg-workvol
97G 58G 34G 64% /work
/dev/vx/dsk/datadg/data01vol
59G 29G 29G 51% /data01
/dev/vx/dsk/datadg/data02vol
59G 24G 33G 43% /data02
/dev/vx/dsk/datadg/data03vol
59G 36G 22G 63% /data03
/dev/vx/dsk/datadg/data04vol
59G 25G 33G 43% /data04
/dev/vx/dsk/datadg/data05vol
59G 30G 28G 52% /data05
/dev/vx/dsk/datadg/data06vol
59G 37G 22G 63% /data06
/dev/vx/dsk/datadg/data07vol
59G 30G 27G 53% /data07
/dev/vx/dsk/datadg/data08vol
59G 47G 12G 80% /data08
/dev/vx/dsk/datadg/data09vol
I tried with sar command. But it is not giving iowait with file system...

Quote:
>sar -u 2 20
Linux 2.6.9-78.0.13.ELlargesmp (itil399) 04/08/2010

04:37:58 PM CPU %user %nice %system %iowait %idle
04:38:00 PM all 0.19 0.00 0.12 0.03 99.66
04:38:02 PM all 0.34 0.00 0.28 0.34 99.03
04:38:04 PM all 0.09 0.00 0.16 0.22 99.53
04:38:06 PM all 0.25 0.00 0.12 0.09 99.53

Any help is appreciated.
# 2  
Old 04-08-2010
does your distribution include iotop? you can run iostat in repeat mode.
# 3  
Old 04-09-2010
Native command which can be used for it for RedHat is vmstat.

It will provide you enough details about what's going on with your system (help to define performance problems as well). However output won't be as 'nice' as one from top with % numbers and it's not as specialized as iostat

I strongly advice to read man page - let us know if you have any questions about it.

Going back to iostat - it's very powerful tool.
As you are using RAID - you need to understand difference between naming conventions. Eg:
cciss/c0d0p1 should be extended to /dev/cciss/c0d0p1

cX == controler number
dX == disk number
pX == partition number

You can read about it more eg. here: HP Smart Array CCISS driver

On top of it you are using LVM. To get more information about your devices you can use commands like:
vgdisplay (you will see volume groups)
lvdisplay (you will see logical volumes)
pvdisplay (you will see phisical volumes - which you probably want to get at this moment).

Regards,
-Artur.
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