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Full Discussion: How to measure IOPS?
Operating Systems Solaris How to measure IOPS? Post 302947623 by achenle on Friday 19th of June 2015 03:33:52 PM
Old 06-19-2015
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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RAIDFILE-CONFIG(8)						    Box Backup							RAIDFILE-CONFIG(8)

NAME
raidfile-config - Configure Box Backup's RAID files SYNOPSIS
raidfile-config config-dir blocksize dir1 [dir2 [dir3]] DESCRIPTION
raidfile-config creates a raidfile.conf file for Box Backup. This file holds information about the directories used to store backups in. Box Backup supports userland RAID, in a restricted RAID5 configuration, where 3 and only 3 'drives' are supported. You can read more about RAID5 (and other RAID-levels) here[1]. Parameters The parameters are as follows: config-dir The directory path where configuration files are located. Usually this is /etc/box. raidfile.conf will be written in this directory. blocksize The block size used for file storage in the system, in bytes. Using a multiple of the file system block size is a good strategy. Depending on the size of the files you will be backing up, this multiple varies. Of course it also depends on the native block size of your file system. dir1 The first directory in the built-in RAID array. dir2 The second directory in the built-in RAID array. If you are not using the built-in RAID functionality, this field should be ignored. You should not use the built-in RAID if you have a hardware RAID solution or if you're using another type of software RAID (like md on Linux). dir3 The third directory in the built-in RAID array. The same notes that apply to dir2 also apply to dir3. Note that there are currently no way to add multiple disk sets to the raidfile.conf file using command line tools, etc. See raidfile.conf(5) for details on adding more disks. BUGS
If you find a bug in Box Backup, and you want to let us know about it, join the mailing list[2], and send a description of the problem there. To report a bug, give us at least the following information: o The version of Box Backup you are running o The platform you are running on (hardware and OS), for both client and server. o If possible attach your config files (bbstored.conf, bbackupd.conf) to the bug report. o Also attach any log file output that helps shed light on the problem you are seeing. o And last but certainly not least, a description of what you are seeing, in as much detail as possible. FILES
raidfile-config generates the raidfile.conf(5) file. SEE ALSO
bbstored-config(8), bbstored.conf(5), raidfile.conf(5) AUTHORS
Ben Summers Per Thomsen James O'Gorman NOTES
1. here http://en.wikipedia.org/wiki/Redundant_array_of_independent_disks#RAID_5 2. mailing list http://lists.warhead.org.uk/mailman/listinfo/boxbackup Box Backup 0.11 10/28/2011 RAIDFILE-CONFIG(8)
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