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 MOJAVE

allocate

allocate(1)                                                                                                                            allocate(1)

NAME

       allocate - device allocation

SYNOPSIS

       allocate [-s] [-U uname] device

       allocate [-s] [-U uname] -g dev-type

       allocate [-s] [-U uname] -F device

       The  allocate  utility  manages  the ownership of devices through its allocation mechanism. It ensures that each device is used by only one
       qualified user at a time.

       The device argument specifies the device to be manipulated. To preserve the integrity of the device's owner, the allocate operation is exe-
       cuted on all the device special files associated with that device.

       The argument dev-type is the device type to be operated on and can only be used with the -g option.

       The default allocate operation allocates the device special files associated with device to the uid of the current process.

       If  the  -F  option  is  specified, the device cleaning program is executed when allocation is performed. This cleaning program is found in
       /etc/security/lib. The name of this program is found in the device_allocate(4) entry for the device in the dev-exec field.

       Only authorized users may allocate a device. The required authorizations are specified in device_allocate(4).

       The following options are supported:

       -g dev-type     Allocates a non-allocated device with a device-type matching dev-type.

       -s              Silent. Suppresses any diagnostic output.

       -F device       Reallocates the device allocated to another user. This option is often used with -U to reallocate a specific  device  to  a
                       specific user. Only a user with the solaris.device.revoke authorization is permitted to use this option.

       -U uname        Uses  the  user  ID uname instead of the user ID of the current process when performing the allocate operation. Only a user
                       with the solaris.device.revoke authorization is permitted to use this option.

       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                      |
       +-----------------------------+-----------------------------+

       deallocate(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                                                        allocate(1)