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тАО12-06-2007 11:38 AM
тАО12-06-2007 11:38 AM
EVA 8100 Controller Usage
For the 8100 i heard that it will load balance between controllers. is this possible ?
my concern was if i have to alllocate 4 TB to a server, as an example, i split it into 500GB each and specify the controller A or B for each LUN on 8000 for load balancing
But for 8100 i can just allocate a 2 TB Lun and then the controllers will load balance.
is this correct for the 8100
thanks
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тАО12-06-2007 01:39 PM
тАО12-06-2007 01:39 PM
Re: EVA 8100 Controller Usage
The EVA 8100 has a new (faster) PowerPC processor, and the enclosures (M5314C) that have switching I/O modules.
- New EVA's fully switched architecture and multiple redundant paths from the controllers to the disk drives provide better data availability compared to traditional arbitrated loop connectivity.
- New controllers with 50 to 70% improvement in cache throughput and up to 24% improved performance
The maximun size for a virtual disks is still 2047 GB.
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тАО12-06-2007 01:40 PM
тАО12-06-2007 01:40 PM
Re: EVA 8100 Controller Usage
Yes, this can be done, but this is from the storage side point of view.
You should also think in the host access patters. If you have multipath software, you should check the load balancing algorithm used by it. Having proxy I/Os could reduce the performance.
This mean that, if you split 4 TB into 500 GB vdisks, distributing between the controllers and you present all to the same host, and the host has 2 HBA, and the access mode is round robin, half of your access will be done using Proxy I/O, that is, accessing the vdisk using the "not owner" controller.
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тАО12-06-2007 06:42 PM
тАО12-06-2007 06:42 PM
Re: EVA 8100 Controller Usage
For Eg. in an exchange server should i create multiple VDISks for each storage and logs ? or one large vdisk and then partition it on the host ?
and why would you do it that way ?
Thanks
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тАО12-23-2007 11:28 AM
тАО12-23-2007 11:28 AM
Re: EVA 8100 Controller Usage
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тАО01-25-2008 01:57 AM
тАО01-25-2008 01:57 AM
Re: EVA 8100 Controller Usage
Is the LUN balancing only consider the quantity of the LUNs or the sizes also?
For example if I have to allocate 3TB to a server, then I separate it into 4 vdisks (1.5TB,1TB,500GB,500GB), is it OK if I put 1.5TB + 1TB to controller A and double 500GB to controller B? (2.5TB vs 1TB)
or should I consider about the LUN sizes also then I pick 500GB + 1.5TB in controller A and 1TB + 500GB in controller B?
Thnx..