Storage DRS Question
Daniel333
Member Posts: 2,077 ■■■■■■□□□□
All,
I am messing with Storage DRS and I notice I have an option for migration if latency is greater than 15ms. Now, is that an average latency over some time? If what is the time parameter?Or will this trigger on an isolated incident that lasts for only a second or two?
thanks,
I am messing with Storage DRS and I notice I have an option for migration if latency is greater than 15ms. Now, is that an average latency over some time? If what is the time parameter?Or will this trigger on an isolated incident that lasts for only a second or two?
thanks,
-Daniel
Comments
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dales
Member Posts: 225
The latency is measured over a period of time and hitting the 15ms is not acted upon immediately rather monitored over hours and and the svmotion will occur if the 15ms is breached for a long period of time (not seconds from memory its in the order of hours). Also the likely effect of svmotion is taken into account so it won't do it if the svmotion will make things worse.Kind Regards
Dale Scriven
Twitter:dscriven
Blog: vhorizon.co.uk -
QHalo
Member Posts: 1,488
I believe the check period is every8 hours for 24 hours. I also believe that latency best practices are as follows:
10/15K drives - < 15ms
7.2k drives - < 30ms
SSD - < 10ms
this should help you out
http://frankdenneman.nl/2012/05/storage-drs-load-balance-frequency/?utm_source=feedburner&utm_medium=feed&utm_campaign=Feed%3A+frankdenneman%2FZjZC+%28frankdenneman.nl%29