topic Re: EVA 6000 series - Max write Latency in Disk Enclosures

EVA 6000 series - Max write Latency

TonyW242 — Fri, 20 Jan 2012 13:55:46 GMT

Hi all,

During some performance monitoring (evaperf vdg) we noticed that on one eva with 2 DG's we have an average write latency of 20ms sometimes even more.

Our other EVA's are at 1ms, max.

What is the maximum accepted latency?

Overall all servers (HPUX, ESX with windows) perform well, except for one that performed very poor during 1 day.

All other servers using lun's on the same DG as the problem server ran normal.

thx,

Tony

Re: EVA 6000 series - Max write Latency

hvhari — Sat, 21 Jan 2012 05:03:56 GMT

This value depends on the number of I/Os, size of I/O operation, number of disks etc. Below two white papers from HP can give you more information on this.

HP StorageWorks Enterprise Virtual Array —A tactical approach to performance problem diagnosis - http://h20195.www2.hp.com/v2/GetPDF.aspx/4AA2-0994ENW.pdf

HP P6000 Enterprise Virtual Array performance - http://h20195.www2.hp.com/v2/GetPDF.aspx/4AA3-3832ENW.pdf