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тАО04-26-2006 04:05 AM
тАО04-26-2006 04:05 AM
Solved! Go to Solution.
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тАО04-26-2006 05:23 AM
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тАО04-26-2006 05:36 AM
тАО04-26-2006 05:36 AM
Re: MSA 1500 Arrays
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тАО04-26-2006 11:13 AM
тАО04-26-2006 11:13 AM
Re: MSA 1500 Arrays
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тАО04-26-2006 04:06 PM
тАО04-26-2006 04:06 PM
Re: MSA 1500 Arrays
So, since I was already going to add more drives to ArrayA for the purposes of creating another LUN, I was hoping that I could just add the drives to the new enclosures and I was thinking that the MSA would spread the LUN across all the disks.
So I guess the real question is "does the LUN actually get tied down to the physical disk or is it virtually spread across all of them?"
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тАО04-27-2006 01:36 AM
тАО04-27-2006 01:36 AM
Re: MSA 1500 Arrays
what you had in mind with adding disks and spreading the LUN automatically over all disks in the array is how the Virtual Arrays like VA7xxx and EVA are designed to work.
I ran a test on a SmartArray 6402 with one array made out of 3 disks on port 1 and one logical drive which takes up the full capacity of the array.
When adding one disk to the MSA30 enclosure on the second channel and expanding the array by including that disk, i can see all disks being accessed when i write to that original LUN (driver x: letter in Windows).
I waited first till the expand and parity initialization was finsihed before writing to the LUN.
So because i did not extended the LUN yet, the above shows that the array already has the LUN spread over all disks right after the array expansion was finished.
Because the MSA1500 is more like the SmartArray family i tend to believe this is also how the MSA would behave in your scenario.
If allowed, you can prove this for yourself by doing the following with your six new disks:
- install the 6 new disks, 2 in each MSA30
- create a raid 5 with 4 disks in the 2 original MSA30
- create a LUN and create a partition in the OS
- write some files to the LUN and wait till the parity initialization is finished (might take some time), you can see this from the ACU status or Windows eventlog
- expand the array with disks from the 2 new MSA30 enclosures
- when the expand is finisihed and the parity initialization also, start writing to the LUN and you will see that all disks in the test array are being accessed, this will prove what you want to know.
HTH
Kris
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тАО04-27-2006 02:00 AM
тАО04-27-2006 02:00 AM
Re: MSA 1500 Arrays
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тАО04-27-2006 03:36 AM
тАО04-27-2006 03:36 AM
Re: MSA 1500 Arrays
According to them:
If I add the new drives to ArrayA in the new shelves, the LUN will not take advantage of the new disks. However, If I expand the existing LUN just a little, the array will recalculate..or whatever it does and will respread the LUN across all disks, thus giving me the desired results.
So, I'm gonna add the shelves at our next downtime, add the disks to the array, expand the existing LUNs by 10 meg or whatever the minimum is and after doing so I'll create the new LUNs.