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Operating Systems Solaris How to map device to mount point? Post 303024682 by bakunin on Monday 15th of October 2018 12:17:24 AM
Old 10-15-2018
Quote:
Originally Posted by Sean
Code:
In any case, the iostat numbers you posted do not look to show any issue.

Correct, it is for test server, not the production server which has the performance issue. The test and the production are setup the same.

I wanted to show the people how to utilize iostat to identify the I/O with the mount points.
But I do not have the root access on production.
I am no Solaris expert by any stretch, but some principles in performance tuning remain the same in every OS: does the production server have "real" disks or is it a virtual guest operating on virtual disks too? If the latter is the case it is probably the wrong place you are looking at anyway. Under the virtual disks there have to be some real devices - the LUNs on a storage box, members of a RAID in the host server, whatever. It is at these systems where you have to measure I/O, not on your virtualised guest.

Consider this (hypothetical) scenario: a server with 5 guests, g1-5 and a disk in this server where virtual disks for these guests reside. If g5 has heavy I/O this will influence the remaining available bandwidth which g1-4 could use. Therefore measurements on g1 because this guest has "intermittent performance issues" will tell you nothing about real issues, it will in fact only tell you when g5 has load peaks. You may not even know what you measure because maybe you don't know what g5 is doing and when.

It is a worthwhile effort to first get a detailed setup so that you can visualise the "flow" between the various interdependent parts of the machinery. Only then test/measure one component after the other to find out where the bottleneck is located.

I hope this helps.

bakunin
 

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halmount(1)							   User Commands						       halmount(1)

NAME
halmount - mount and umount filesystems via hal SYNOPSIS
halmount [OPTIONS]... <device|label> [mountpoint] halmount -u [OPTIONS]... <device|label|mountpoint> halmount -e [OPTIONS]... <device|label|mountpoint> DESCRIPTION
halmount can mount and umount filesystems via hal. Hotpluggable devices and media such as USB sticks and CD-ROMs are typically not entered into /etc/fstab and are therefore not mountable by normal users via the mount(8) command. Instead hal provides methods to mount and umount such devices. Additionally it's also possible to eject devices. For devices like USB sticks eject means the device cannot be mounted again until the stick is re-plugged, ie a "save remove" feature. OPTIONS
-t TYPE specify the file system type to use -o OPTIONS specify mount options -v verbose listing of devices -u umount specified device -e umount and eject specified device -a perform requested mount/umount/eject operation all available devices --listudi list UDIs of devices, useful for debugging EXAMPLES
halmount list all mountable devices known to hal halmount /dev/hdc mount device hdc on default mount point (/media/volumelabel) halmount /dev/hdc cdrom mount device hdc on /media/cdrom halmount -u "Holiday Pictures" umount device that has the label "Holiday Pictures" SEE ALSO
mount(8), umount(8), eject(1), fstab(5) SUSE Linux November 2006 halmount(1)
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