How to map device to mount point? Post: 303024682

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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

10-15-2018

Registered User

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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LEARN ABOUT DEBIAN

deallocate

deallocate(1)															     deallocate(1)

NAME

       deallocate - device deallocation

SYNOPSIS

       deallocate [-s] device

       deallocate [-s] [-F] device

       deallocate [-s] -I

       The  deallocate utility deallocates a device allocated to the evoking user. device can be a device defined in  device_allocate(4) or one of
       the device special files associated with the device. It resets the ownership and the permission on all device special files associated with
       device, disabling the user's access to that device. This option can be used by an authorized user to remove access to the device by another
       user. The required authorization is solaris.device.allocate.

       When deallocation or forced deallocation is performed, the appropriate device cleaning program is  executed,  based  on	the   contents	of
       device_allocate(4).  These cleaning programs are normally stored in /etc/security/lib.

       The following options are supported:

       device	       Deallocate the device associated with the device special file specified by device.

       -s	       Silent. Suppresses any diagnostic output.

       -F device       Forces  deallocation of the device associated with the file specified by device. Only a user with the solaris.device.revoke
		       authorization is permitted to use this option.

       -I	       Forces deallocation of all allocatable devices. Only a user with the solaris.device.revoke authorization  is  permitted	to
		       use this option. This option should only be used at system initialization.

       The following exit values are returned:

       non--zero       An error occurred.

       /etc/security/device_allocate

       /etc/security/device_maps

       /etc/security/dev/*

       /etc/security/lib/*

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Availability		     |SUNWcsu			   |
       +-----------------------------+-----------------------------+

       allocate(1), list_devices(1), bsmconv(1M), dminfo(1M), mkdevalloc(1M), mkdevmaps(1M), device_allocate(4), device_maps(4), attributes(5)

       The  functionality  described  in  this man page is available only if the Basic Security Module (BSM) has been enabled. See bsmconv(1M) for
       more information.

       /etc/security/dev, mkdevalloc(1M), and mkdevmaps(1M) might not be supported in a future release of the Solaris Operating Environment.

								    28 Mar 2005 						     deallocate(1)