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тАО05-04-2008 11:02 AM
тАО05-04-2008 11:02 AM
MSA2012i - Redundancy and bandwidth
in the MSA2012i the four GbE ports will be used simultanously or just only one controller per times?
I'm asking this becouse I'm valuating the overall performance for the MSA but I don't understand if I'll have a 4gbit SAN connection or only 1 or 2 gbit..
Thanks in advance.
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тАО05-05-2008 04:52 AM
тАО05-05-2008 04:52 AM
Re: MSA2012i - Redundancy and bandwidth
There are two GbE ports per Controller.
Controller A A0 and A1
Controller B B0 and B1
A0 and B0 need to be on the same subnet
A1 and B1 need to be on the same subnet
Example, Controller A owns the LUN, if you setup iscsi initiator for Round Robin load balancing, Both server nics and ports on Controller A will be Active.
jk
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тАО05-05-2008 05:05 AM
тАО05-05-2008 05:05 AM
Re: MSA2012i - Redundancy and bandwidth
2gbit is too slow.
I need to use it as a shared storage for some VirtualMachine and some mail servers but with 2gbit is impossible.
For example, using 10 SATA disks i'll archive more or less 1500MB of througput that is 12Gbit.
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тАО05-05-2008 06:04 AM
тАО05-05-2008 06:04 AM
Re: MSA2012i - Redundancy and bandwidth
If you create a second VDisk and volumes it will be created on Controller B.
You can then balance the IO between the two controllers.
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тАО05-05-2008 06:10 AM
тАО05-05-2008 06:10 AM
Re: MSA2012i - Redundancy and bandwidth
So maximum bandwidth for one server to one volume di 2gbit.
And if that controller fails? Volume will be switched over the other controller automatically?
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тАО05-05-2008 08:52 AM
тАО05-05-2008 08:52 AM
Re: MSA2012i - Redundancy and bandwidth
If you want to test it. Don't pull Controller A. Start some IO to your volume.
Just go to the SMU interface and perform shutdown on controller A. You will see a pause in the IO, because ownership changes and then IO will resume.
jk
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тАО05-05-2008 08:54 AM
тАО05-05-2008 08:54 AM
Re: MSA2012i - Redundancy and bandwidth
I'm asking so because i want to virtualize some servers but I think that 2gbit are too slow.
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тАО05-06-2008 01:01 AM
тАО05-06-2008 01:01 AM
Re: MSA2012i - Redundancy and bandwidth
mmmhh... I don't think that it will be to slow. Your bottleneck will be the disk performance. More disks, more performance. You can load balance the load between the controller with the logical drive assignment to the controllers. If you think that 2 GBit Ethernet is too slow, buy an EVA with 4 GB FC and the matching FC infrastructure.
How many guest will you use? How many disks will be in the MSA?
Best regards,
Patrick
Patrick
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тАО05-06-2008 01:32 AM
тАО05-06-2008 01:32 AM
Re: MSA2012i - Redundancy and bandwidth
I think that with 6 SATA disk in Raid1 i'll archieve a thoughtput of 450mbit that are 3600mbit that are more than the maximum performances that a single controller can goes.
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тАО05-06-2008 03:00 AM
тАО05-06-2008 03:00 AM
Re: MSA2012i - Redundancy and bandwidth
4500mbit = 56MB/s performance.
You need to look at your application transfer block size. Example, most backup apps are either 64k or 128k. Most copies are 64k. Depending on version of exchange, 4k-64k. So you can see there is some variation.
If you are concerned about the controllers performance, why use SATA. The SAS drives are more capable of handling IO than SATA.
BTW, I just happen to have my system up and running in the lab with a 6 disk raid 1. Using IOmeter, I'm able to acheive ~90MB/s. I'm sure I could squeeze out a little more.
If you feel that's still not enough you could look into the enhanced version of the MSA2012FC.