topic EVA proxy writes in HPE EVA Storage

EVA proxy writes

AlecMac — Thu, 04 Nov 2010 11:03:22 GMT

Hi,

Quick question. The technical team have removed proxy reads from the EVA, but we still see proxy writes. Do proxy writes add to mirror port traffic, or processor usage? Or does it make no difference 'coz all writes are mirrored anyway?

Regards
Alec

Re: EVA proxy writes

Chris Callihan_1 — Fri, 05 Nov 2010 00:14:37 GMT

yes - all writes will be mirrored to the other controller over the mirror port. So if the total write MB/s does not match up to the mirror port traffic, the difference is your proxy reads.

Re: EVA proxy writes

AlecMac — Fri, 05 Nov 2010 07:54:48 GMT

Thanks for the reply. Not sure it really covers what I'm seeing.

When I track MB/s Writes and Mirror port use on from a perf log mirror port usage is pretty much double the total writes. There are no proxy reads logged, but some LUNs have proxy writes.

I've attached some tracks.

Re: EVA proxy writes

AlecMac — Fri, 05 Nov 2010 08:21:43 GMT

Here's another track over a shorter time that shows writes and mirror port use more clearly.