Hi Jeff,
AFAIK as previously mentioned, only network speed is affected.
But did you think of the priority command?
There you can change relative (!) priorities, e.g. system (-> SnapMirror) vs. user.
priority set volume prodvol level=high system=low
Set the priority scheduling policy for volume prodvol to high compared to other volumes. Also prioritize system operations for the volume low compared to user operations on the same volume. These options are enabled by this operation if priority on has been previous issued.
So you would set 'level=high' on the volumes where the users are impacted and 'system=low' and maybe "level=low" (if the source isn't the one where the users are impacted) to the volumes involved in the SnapMirror.
Don't forget to set 'priority on'.
And maybe 'priority off' after the snapmirror is through if you want to go back to the previous behavior.
HTH (Hi Oldtimers, still know this one? - Hope That Helps...)
Sebastian
On 01.08.2013 07:15, Jeff Cleverley wrote:
I did try different positions for the -k. It didn't seem to matter.
Jeff
On Wed, Jul 31, 2013 at 8:45 PM, steve klise <sklise@hotmail.com> wrote:
I am not sure, but you may want to change your syntax to put the -k before the -S; Not sure if that really matters, but this is what I found in one of the docs..
Good luck.
snapmirror update [-k n] -S source_system:source_volume
[dest_system:]dest_volume
Date: Wed, 31 Jul 2013 19:54:46 -0600
Subject: Snapmirror throttle not working
From: jeff.cleverley@avagotech.com
To: Toasters@teaparty.net
Greetings,
I'm running 8.1.2P4, 7-mode on some 6290s.à I need to do some snapmirrors to re-balance some disk space.à The -k option to throttle the transfer doesn't seem to be having any effect.à I've tried modifying the placement of the -k but it doesn't seem to matter.à I also tried to modify it after it was running and it doesn't seem to help either.à Here is the command I'm running:The source and destination are on the same file system.à Here is a cut of a sysstat 3 after starting it:
snapmirror initialize -S sm15_3 -k 10000 new_sm15_3
If I'm understanding correctly, this should be allowing 10MB/s.
àCPUàààà NFSààà CIFSààà HTTPàààà Netàà kB/sààà Diskàà kB/sààà Tapeàà kB/sà Cache
ààààààààààààààààààààààààààààààààà inààà outààà readà writeààà readà writeààà age
73%àààà 598àààààà 0àààààà 0ààà 2091 349080à 338016ààà 271àààààà 0ààààà 0àààà 7
à71%ààà 1019àààààà 0àààààà 0ààà 2046 319892à 324019à 13114àààààà 0ààààà 0àààà 0s
à71%ààà 2800àààààà 0àààààà 0ààà 3880 330527à 343528à 17379àààààà 0ààààà 0àààà 7
à69%ààà 1440àààààà 0àààààà 0ààà 3405 330279à 392647à 22343àààààà 0ààààà 0àààà 0s
à87%ààà 1614àààààà 0àààààà 0ààà 2128 320151à 607753 168553àààààà 0ààààà 0àààà 0s
à87%àààà 827àààààà 0àààààà 0ààà 5652 244701à 584436 371689àààààà 0ààààà 0àààà 0s
à91%àààà 897àààààà 0àààààà 0ààà 4242 344072à 680454 386373àààààà 0ààààà 0àààà 0s
As you can see, the disk read/write counts go way up.à This is causing some noticeable latency in the nfs access for clients.à While I really like the new hardware can pump data around, I need to be able to control it.
What am I doing wrong?
Thanks,
Jeff
--
Jeff Cleverley
Unix Systems Administrator
4380 Ziegler Road
Fort Collins, Colorado 80525
970-288-4611
_______________________________________________ Toasters mailing list Toasters@teaparty.net http://www.teaparty.net/mailman/listinfo/toasters
--
Jeff Cleverley
Unix Systems Administrator
4380 Ziegler Road
Fort Collins, Colorado 80525
970-288-4611
_______________________________________________ Toasters mailing list Toasters@teaparty.net http://www.teaparty.net/mailman/listinfo/toasters