How to measure IOPS? Post: 302947623

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Operating Systems Solaris How to measure IOPS? Post 302947623 by achenle on Friday 19th of June 2015 03:33:52 PM

06-19-2015

Registered User

Have you bought the storage yet? If so, what are the physical disks?

Because 7,000 IO ops/sec w/ a 20 ms response time is not an easy goal easy to meet.

And how is that 20 ms defined? Average response time or max response time?

---------- Post updated at 03:33 PM ---------- Previous update was at 03:24 PM ----------

Quote:

Originally Posted by jim mcnamara

...

I suspect you do not have a problem - check first. I also hope you did not order the NAS hardware - sounds like it was thrown at you.

Except that there are so many ways for someone not familiar with doing high-performance IO to ruin performance.

Such as "Let's set up a 27-disk RAID-6 array with a 1 MB block size per disk! Because bigger is faster!"

Then the array gets partitioned out into 34 different LUNs, so that every server in the data center has its IO contending with every other server in the data center over the same physical disks. And then wonder why the critical app they're running - that does IO via 17 layers of C++ iostreams and winds up doing 4 kb random writes all over the place because some developer whose only tool is to write more and more code reinvented the concept of a "database" but has no clue how to do it competently - is slow.

(And 4 years later only one server is left using a single LUN on that array because everyone bailed on it because performance stunk on the expensive hardware that was supposed to fix all their storage issues, but no one can figure out a good way to migrate that last server off it - and hey, it seems to be working just fine now...)

Last edited by achenle; 06-19-2015 at 04:39 PM..

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LEARN ABOUT DEBIAN

install-solaris

install-solaris(1M)													       install-solaris(1M)

NAME

       install-solaris - install the Solaris operating system

SYNOPSIS

       install-solaris

       install-solaris	invokes  the  Solaris  Install	program. Depending on graphical capability and available memory at the time of invocation,
       install-solaris invokes either a text-based installer or a graphical installer.

       The following minimum requirements for physical memory dictate which features are available during installation:

       For SPARC machines:

       128 MB

	   Minimum physical memory for all installation types

       128 MB

	   Minimum physical memory required for windowing system

       384 MB

	   Minimum physical memory required for graphical-based installation

       For x86 machines:

       256 MB

	   Minimum physical memory for all installation types

       256 MB

	   Minimum physical memory required for windowing system

       512 MB

	   Minimum physical memory required for graphical-based installation

       In some cases, even if the minimum physical memory is present, available virtual memory after system startup can limit the number  of  fea-
       tures available.

       install-solaris	exists	only  on  the Solaris installation media (CD or DVD) and should be invoked only from there. Refer to the  for more
       details.

       install-solaris allows installation of the operating system onto any standalone system. install-solaris loads the software available on the
       installation media. Refer to the  for disk space requirements.

       Refer to the  for more information on the various menus and selections.

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

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Availability		     |SUNWcdrom  (Solaris instal-  |
       |			     |lation media)		   |
       +-----------------------------+-----------------------------+
       |Interface Stability	     |Evolving			   |
       +-----------------------------+-----------------------------+

       pkginfo(1), install(1M), pkgadd(1M), attributes(5)

       It is advisable to exit install-solaris by means of the exit options in the install-solaris menus.

								    23 Sep 2005 					       install-solaris(1M)