topic Re: Bandwidth/Performance for EVA4400 and IP DIstance Gateway in HPE EVA Storage

Bandwidth/Performance for EVA4400 and IP DIstance Gateway

Michael W. Burden — Fri, 17 Apr 2009 15:37:55 GMT

Good morning,

We are considering a pair of EVA4400s, replicated over a WAN using a pair of IP Distance Gateways.

Assuming that each EVA4400 has two vraid6 disk groups (one with 11 450GB 15000RPM drives and one with 10 146GB 15000RPM drives) and the drives are approximately 25% busy with a 75% read / 25% write workload, how much bandwidth will be required for replication to keep up with the workload?

In a related question, what kind of compression ratios does the IP Distance Gateway deliver?

Re: Bandwidth/Performance for EVA4400 and IP DIstance Gateway

shIVinator. — Thu, 23 Apr 2009 11:52:02 GMT

In order to accurately calculate the required bandwidth we will need to know how much bandwidth you are generating and IOPS as well.

What I can tell you is that 10 15k drives will yield about 1069 IOPS at VRAID5 and 1496 at VRIAD1. I don't have any calculations for VRAID6 but I would assume that it would be less than VRAID5. These number are based on a random workload.

Duane

Re: Bandwidth/Performance for EVA4400 and IP DIstance Gateway

kiranchitnis — Fri, 24 Apr 2009 05:36:14 GMT

I have a relative question on this discussion.

I have an EVA 4400 running in site A and an EVA 4400 running in site B.

I have an Oracle database server writing data on EVA4400 in site A.

I have an Oracle database server writing data on EVA400 in in site B.

Can I replicate all data from the EVA on site A to site B and vice versa while both the oracle servers are reading and writing data on the respective EVA's in the sites?

Re: Bandwidth/Performance for EVA4400 and IP DIstance Gateway

Víctor Cespón — Fri, 24 Apr 2009 05:52:58 GMT

You can perform replication in both directions. Meaning that server in site A writes to a disk that is copied to site B and cannot be writed to on site B. It can be presented to a server with no access or read-only access. The same for server on site B.

The roles will be interchanged when you perform a failover. The destination disk will change from read-only to read-write and will become the new source, copying the new data to the other side.

Re: Bandwidth/Performance for EVA4400 and IP DIstance Gateway

Michael W. Burden — Fri, 24 Apr 2009 18:08:18 GMT

If we're planning on Asynchronous replication, then is the IOPS as important as the WKB/S?

In any case, our LUNs currently look like:

AVG MAX AVG MAX
LUN W/S W/S WKB/S WKB/S
====== ===== ===== ===== =====
FPS1 F 8 207 292 11,155
FPS1 D 0 1 0 2
FPS1 E 20 525 416 30,514
SVC2 E 0 3 0 133
SVC2 I 3 1,058 29 4,185
SVC3 K 15 360 128 5,267
WOOD D 29 931 435 32,905
WOOD E 12 739 356 21,125
WOOD T 11 417 526 25,098
WOOD H 4 271 1,509 26,788
WOOD I 7 787 150 17,643