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тАО03-06-2008 05:42 PM
тАО03-06-2008 05:42 PM
I cannot find a best practice guide when configuring arrays or luns. Can somone point me to one? I am about to wipe our current configuration and redo it since we just got a EVA4100 for high speed databases.
Our system:
MSA1500cs 2 controllers Active/Active
4 shelves
28 146GB disks
28 300GB disks
I keep hearing not to create a raid 1+0 set of 28 disks and slicing off luns from it. Which I planned to do.
So what is the max number of disks supported in a array? I know the max number of luns is 32.
If you create multiple LUNS from a large array can you delete the original LUN you created after you created 4 others? I thought it was a yes since it is much like a Smart Array 6404 controller.
Much help is needed please post any guides or documents you can find or tips. I have looked at all the HP Reference guides with no help.
Solved! Go to Solution.
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тАО03-06-2008 06:16 PM
тАО03-06-2008 06:16 PM
Re: MSA1500cs best practices
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тАО03-10-2008 05:28 AM
тАО03-10-2008 05:28 AM
SolutionDeleting luns on an MSA array is restricted in that if you create luns 1,2,3,4 on array A, you have to delete them in reverse order 4,3,2,1. So you need to plan carefully and do the math to see how many arrays you need to create to support all the luns you need. If you are using MSA FW v7.00 you can spread the active luns across both controllers to balance I/O.
The downside is when you need to change or grow a lun or want to remove one completely. Unless its the last lun created on the array it will just sit there unused.
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тАО03-10-2008 05:59 AM
тАО03-10-2008 05:59 AM
Re: MSA1500cs best practices
Here is a good document on found on MSA and Array configurations best practices.
http://h71019.www7.hp.com/ActiveAnswers/downloads/4AA1-0172ENW.pdf
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тАО03-10-2008 06:40 AM
тАО03-10-2008 06:40 AM
Re: MSA1500cs best practices
As the maximum number of SCSI disk drives is 42 (MSA1000) or 56 (MSA1500cs) you would have to use several single-disk drive arrays, or - ugghh - start using MSA20 enclosures.
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тАО03-10-2008 07:00 AM
тАО03-10-2008 07:00 AM
Re: MSA1500cs best practices
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тАО03-10-2008 07:13 AM
тАО03-10-2008 07:13 AM
Re: MSA1500cs best practices
I meant to say that you would have to use disk drive arrays made of a single disk drive to reach that limit (32 arrays) when sticking to SCSI disk drives.
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тАО03-10-2008 07:52 AM
тАО03-10-2008 07:52 AM
Re: MSA1500cs best practices
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тАО03-10-2008 08:02 AM
тАО03-10-2008 08:02 AM
Re: MSA1500cs best practices
The MSA can deal with disk drive arrays smaller than 8 disk drives.
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тАО03-10-2008 08:14 AM
тАО03-10-2008 08:14 AM