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Full Discussion: Tuning AIX IO
Top Forums UNIX for Advanced & Expert Users Tuning AIX IO Post 302181760 by theerthan on Friday 4th of April 2008 03:04:20 AM
Old 04-04-2008
Tuning AIX IO

Hi

I am trying to investigate a disk performance issue, and we are not seem to be hitting the right direction in our analysis.

This is a FC disk running on USP1000 HDS system. The application is an IO intensive application, but our opinion is that it is not performing due to perceived disk issues.

Analysis:

iostat on the disk shows over various iterations, something like:

Disks: %tm_act Kbps tps Kb_read Kb_wrtn time
hdisk40 27 257.5 50.1 2551 12900 0:01:12
hdisk40 7.8 305.6 20.8 9088 9244 0:02:12
hdisk40 0.9 14 2.1 160 680 0:03:12
hdisk40 0.7 8.4 1.3 16 488 0:04:12
hdisk40 2.6 205 9.8 11012 1288 0:05:12
hdisk40 8.9 1055 50.1 57140 6160 0:06:12
hdisk40 6.1 1117.4 49.1 63432 3608 0:07:12
hdisk40 5.6 810.9 35.1 46488 2164 0:08:12
hdisk40 0.7 6.3 1 0 380 0:09:12
hdisk40 7.3 320 12.9 4988 14208 0:10:12
hdisk40 29.4 1751.5 83.3 19948 85128 0:11:12

To calculate the throughput here, is it OK to just take (Kb_read+Kb_wrtn)/1024 to get the throughput in MBPS?

Is iostat a reliable way to calculate throughput or do I have to necessarily use nstress?

Is there a problem with this disk?

Thanks
Theerthan
 

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vxreattach(1M)															    vxreattach(1M)

NAME
vxreattach - reattach disk drives that have once again become accessible SYNOPSIS
/etc/vx/bin/vxreattach [-br ] [accessname...] /etc/vx/bin/vxreattach -c accessname DESCRIPTION
The vxreattach utility reattaches disks to the disk group they were in and retains the same media name. This operation may be necessary if a disk has a transient failure, or if Veritas Volume Manager (VxVM) starts with some disk drivers unloaded and unloadable. Disks then enter the failed state. If the problem is fixed, vxreattach may be able to reattach the disks without plexes being flagged as stale, as long as the reattach happens before any volumes on the disk are started. vxreattach tries to find a disk in the same disk group with the same disk ID for the disk(s) to be reattached. The reattach operation may fail even after finding the disk with the matching disk ID if the original cause (or some other cause) for the disk failure still exists. vxreattach is usually invoked by vxdiskadm when performing disk recovery. It is not intended to be run directly by an administrator. OPTIONS
-b Performs the reattach operation in the background. -c Checks if a reattach is possible. No operation is performed, but the name of the disk group and disk media name at which the disk can be reattached is displayed. -r Tries to recover stale plexes of any volumes on the failed disk. It does this by calling vxrecover. EXIT CODES
A zero exit status is returned if the reattach is performed; non-zero is returned otherwise. See vxintro(1M) for a list of standard exit codes. EXAMPLES
Check if reattachment of disk c1t2d0 is possible: /etc/vx/bin/vxreattach -c c1t2d0 If reattachment is possible, vxreattach returns with an exit status of 0 and displays the disk group name and disk media name. If reat- tachment is not possible, vxreattach returns an exit status of 2 and displays an error. Attempt to reattach the disk in the foreground and try to recover stale plexes of any volumes on the disk: /etc/vx/bin/vxreattach -r c1t2d0 If the reattachment is successful, vxreattach returns an exit status of 0. Otherwise, if an error occurs, vxreattach returns a non-zero exit code as defined on vxintro(1M). FILES
/etc/default/vxplex Standard defaults file that can be used to determine whether FastResync is used when attaching plexes. See vxplex(1M) for details. SEE ALSO
vxdiskadm(1M), vxintro(1M), vxplex(1M), vxrecover(1M) VxVM 5.0.31.1 24 Mar 2008 vxreattach(1M)
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