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 FREEBSD

bhyveload

BHYVELOAD(8)						    BSD System Manager's Manual 					      BHYVELOAD(8)

NAME

     bhyveload -- load a FreeBSD guest inside a bhyve virtual machine

SYNOPSIS

     bhyveload [-c cons-dev] [-d disk-path] [-e name=value] [-h host-path] [-m mem-size] vmname

DESCRIPTION

     bhyveload is used to load a FreeBSD guest inside a bhyve(4) virtual machine.

     bhyveload is based on loader(8) and will present an interface identical to the FreeBSD loader on the user's terminal.

     The virtual machine is identified as vmname and will be created if it does not already exist.

OPTIONS

     The following options are available:

     -c cons-dev
	     cons-dev is a tty(4) device to use for bhyveload terminal I/O.

	     The text string "stdio" is also accepted and selects the use of unbuffered standard I/O. This is the default value.

     -d disk-path
	     The disk-path is the pathname of the guest's boot disk image.

     -e name=value
	     Set the FreeBSD loader environment variable name to value.

	     The option may be used more than once to set more than one environment variable.

     -h host-path
	     The host-path is the directory at the top of the guest's boot filesystem.

     -m mem-size [K|k|M|m|G|g|T|t]
	     mem-size is the amount of memory allocated to the guest.

	     The mem-size argument may be suffixed with one of K, M, G or T (either upper or lower case) to indicate a multiple of Kilobytes,
	     Megabytes, Gigabytes or Terabytes respectively.

	     The default value of mem-size is 256M.

EXAMPLES

     To create a virtual machine named freebsd-vm that boots off the ISO image /freebsd/release.iso and has 1GB memory allocated to it:

	   bhyveload -m 1G -d /freebsd/release.iso freebsd-vm

     To create a virtual machine named test-vm with 256MB of memory allocated, the guest root filesystem under the host directory
     /user/images/test and terminal I/O sent to the nmdm(4) device /dev/nmdm1B

	   bhyveload -m 256MB -h /usr/images/test -c /dev/nmdm1B test-vm

SEE ALSO

     bhyve(4), nmdm(4), vmm(4), bhyve(8), loader(8)

HISTORY

     bhyveload first appeared in FreeBSD 10.0, and was developed at NetApp Inc.

AUTHORS

     bhyveload was developed by Neel Natu <neel@FreeBSD.org> at NetApp Inc with a lot of help from Doug Rabson <dfr@FreeBSD.org>.

BUGS

     bhyveload can only load FreeBSD as a guest.

BSD
								  January 7, 2012							       BSD