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Perc H310 on PE T320
Hello all,
I recently ordered a T320 with a Perc H310 controller with two internal SAS hard drives. Unfortunatly, I made a mistake and ordered the configuration to be Raid 0 instead of Raid 1. Will I be able to do a Raid Level Migration from Raid 0 to Raid 1 even though the Raid 0 is across two disks?
Thanks!
theflash1932
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October 10th, 2012 10:00
No, the RLM doesn't work that way. You can only migrate to a larger array - you can't take away space.
DELL-Chris H
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October 10th, 2012 10:00
Yes the H310 is capable of migration from a Raid 0 to a Raid 1, as long as there is only 1 disk in the Raid 0 going to the 2 drive raid 1. Since you have a 2 drive raid 0 you can't migrate to a raid 1 as you can't reduce the size of the array during migration. Simply you can't take 2 drives worth of raid 0 data and move them to a single drive (to be mirrored) in the Raid 1.
Now with that being said, you CAN add a drive and migrate the array to a 3 drive raid 5, this is from your current configuration of a 2 drive raid 0.
You can find additional migration information on page 18 here - support.dell.com/.../UG_PERC8_en.pdf
Let me know if this helps.
theflash1932
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October 10th, 2012 12:00
Generally speaking ... increased read speeds is the only upside to that; write speeds will decrease on RAID 5.
bpiela
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October 10th, 2012 12:00
Thanks to both Chris and theflash. So, I have two options. One is to grow the Raid 0 to a 3 disk Raid 5 or I can destroy the Raid 0 and create a Raid 1 and reload the OS. I am leaning towards reloading the OS. This server is supposed to be a LOB App server. Any thoughts on why I might want to go Raid 5? This raid group will be supporting the OS and the Apps.