Re: EVA6000 write speed over 180MB/s ? (244 Views)
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Honored Contributor
Jan Soska
Posts: 1,225
Registered: ‎01-22-2008
Message 1 of 14 (244 Views)
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EVA6000 write speed over 180MB/s ?

Hello all,
we are doing some tuning tests on our older EVA6000. As we already knew, write speed could peek max 180MB/s due 2Gbit connection between eva controllers (say design feature).
For some reason, we created raid0 vdisk and our tests are big surprise - on disk group with 28 15K 136GB drives we reached 360MB/s write (with write cache enabled) and 260MB/s (with write cache disabled). See screenshot.
Any ideas how it is possible?
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Honored Contributor
Sivaramakrishna_1
Posts: 314
Registered: ‎12-28-2006
Message 2 of 14 (244 Views)

Re: EVA6000 write speed over 180MB/s ?

Hi,

that 180MB/s is a single port bandwidth. If you have multipathing solution the IO will pass through all the ports, so max bandwitdh will be 180MB*4 (As EVA 6000 will have 2 ports per controller). Hope this may be the situation in your case!!!

Siva...
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Honored Contributor
Patrick Terlisten
Posts: 1,781
Registered: ‎07-12-2005
Message 3 of 14 (244 Views)

Re: EVA6000 write speed over 180MB/s ?

Hello,

360 MB/s can be reached by using two host-ports. If you're using MPIO it will distribute the load over all active and optimized paths.

Regards,
Patrick
Regards,
Patrick
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Honored Contributor
Jan Soska
Posts: 1,225
Registered: ‎01-22-2008
Message 4 of 14 (244 Views)

Re: EVA6000 write speed over 180MB/s ?

hello,
maybe I am wrong,
but have we can reach this in 1 single 2Gb pipeline between controllers? And why other raids like r10 do not perform the same way?
I think it is not multipath related,
I'll test it on other server without mpio.

jan
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Honored Contributor
Patrick Terlisten
Posts: 1,781
Registered: ‎07-12-2005
Message 5 of 14 (244 Views)

Re: EVA6000 write speed over 180MB/s ?

360 MB/s with a single pathed EVA?! Sure that the EVA isn't an EVA6100?

Regards,
Patrick
Regards,
Patrick
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Honored Contributor
Jan Soska
Posts: 1,225
Registered: ‎01-22-2008
Message 6 of 14 (244 Views)

Re: EVA6000 write speed over 180MB/s ?

Yes, I am pretty sure, HSV200, 6240 firware.
I can't believe my eyes, that's why I'm asking how it could be... :)

Jan
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Honored Contributor
Sivaramakrishna_1
Posts: 314
Registered: ‎12-28-2006
Message 7 of 14 (244 Views)

Re: EVA6000 write speed over 180MB/s ?

Hi,

The "HSV 200" you are observing from Command View EVA??? or the Physical Plastic Bezil of the Controller.

Why because, there are 3 models of HSV 200 controllers.

HSV 200 - 2Gb Port speed
HSV 200-A - 4Gb port speed
HSV 200-B - 4Gb Port speed(4100/6100)

All the models will be appeared as only HSV 200 in Command view EVA!!!!
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Honored Contributor
Jan Soska
Posts: 1,225
Registered: ‎01-22-2008
Message 8 of 14 (244 Views)

Re: EVA6000 write speed over 180MB/s ?

Hello,
it is just normal HSV200, with 4Gb hosts port, and as I know, 2Gb mirror connection.
So, pretty interesting.

Jan
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Honored Contributor
Sivaramakrishna_1
Posts: 314
Registered: ‎12-28-2006
Message 9 of 14 (244 Views)

Re: EVA6000 write speed over 180MB/s ?

Hi Jan,

It is sure that if the host port speed is 4Gb, either the controller would be HSV200-A or HSV200-B.

The initial model of this EVA was only with 2GB Host port, where as the Device and Mirror port speeds are 2Gb for all models.

If the host port speed is 4Gb then there is no surpise in getting 360MB/s...
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Honored Contributor
Uwe Zessin
Posts: 10,320
Registered: ‎02-16-2004
Message 10 of 14 (244 Views)

Re: EVA6000 write speed over 180MB/s ?

A HSV200 controller module (even the first generation) has TWO mirror ports.
.
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Honored Contributor
Jan Soska
Posts: 1,225
Registered: ‎01-22-2008
Message 11 of 14 (244 Views)

Re: EVA6000 write speed over 180MB/s ?

Uwe - direct hit, checked manually in server room. No it makes sense to reach 360MB with 2x2Gbit mirror port.

Btw - we can not go over 180MB/s with r10 writes. Is it becouse r10 takes more bandwith (like each write goes to 2 disks -> 2x180MB/s)?

Jan
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Honored Contributor
Uwe Zessin
Posts: 10,320
Registered: ‎02-16-2004
Message 12 of 14 (244 Views)

Re: EVA6000 write speed over 180MB/s ?

Sounds reasonable.
The HSV200 has two loop ports to the disks. A VRAID-10 write requires twice the bandwidth, because the data goes to two disk drives.

In that case the second mirror port doesn't help, because cache mirrored data need to be replicated only once.
.
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Honored Contributor
Jan Soska
Posts: 1,225
Registered: ‎01-22-2008
Message 13 of 14 (244 Views)

Re: EVA6000 write speed over 180MB/s ?

New record, after understanding Uwe's post I created 2 raid10 luns on the same disk group, presented to 1 win servers (each lun on different controller), created dynamic disk (stripped) and bingo - 420MB/s read, 230MB/s write.

Nice.

Jan
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Honored Contributor
Jan Soska
Posts: 1,225
Registered: ‎01-22-2008
Message 14 of 14 (244 Views)

Re: EVA6000 write speed over 180MB/s ?

Uwe helped
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