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RAID 50 Configuration Advice


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#1 Dave A

Dave A

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Posted 21 June 2013 - 08:24 AM

Hi there,

I'm a RAID novice so please bear with me...

I have some very specific constraints.

I have an HP DL360 with 10 1.2 TB 10K disks - the max this box will take. I need RAID and I need around 9TB useable. The workload is predominantly large sequential write and random read. I'd like to reserve a drive for OS and swap. I'm looking to get the best balance of read/write performance.

My thought therefore is to use RAID 5+0. I am thinking of 3 RAID 5 sets of 3 disks each, then stripped. Is there a better configuration given the above constraints?

This box comes with these controllers as standard:
HP Smart Array P420i/1GB with FBWC (RAID 0/1/1+0/5/5+0)
HP Smart Array P420i/2GB with FBWC (RAID 0/1/1+0/5/5+0)
HP Smart Array P420i/1GB FBWC (RAID 0/1/1+0/5/5+0)

I'm assuming the 2Gb version is best to help mitigate the write penalty. Any comments on controllers would be welcome.

Thanks!
Dave

#2 Highroller54

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Posted 04 July 2013 - 01:40 PM

For the best performance and best data retention I would recommend Raid 50. In raid 50 just as in raid 5 anything over 4 to 5 disks in an array your percentages of data loss rises. So in order to stay in a fail safe area, never build a raid 5 array larger than 4 or 5 disks. So under raid 50, you will want to create two 4 or 5 disk arrays under raid 5 and both will be covered under raid 0 in raid 50. This will give you the highest redundancy and leave you a drive for a hot spare. I hope I explained this correctly, if not I'm sure others will chime in..

Hi there,

I'm a RAID novice so please bear with me...

I have some very specific constraints.

I have an HP DL360 with 10 1.2 TB 10K disks - the max this box will take. I need RAID and I need around 9TB useable. The workload is predominantly large sequential write and random read. I'd like to reserve a drive for OS and swap. I'm looking to get the best balance of read/write performance.

My thought therefore is to use RAID 5+0. I am thinking of 3 RAID 5 sets of 3 disks each, then stripped. Is there a better configuration given the above constraints?

This box comes with these controllers as standard:
HP Smart Array P420i/1GB with FBWC (RAID 0/1/1+0/5/5+0)
HP Smart Array P420i/2GB with FBWC (RAID 0/1/1+0/5/5+0)
HP Smart Array P420i/1GB FBWC (RAID 0/1/1+0/5/5+0)

I'm assuming the 2Gb version is best to help mitigate the write penalty. Any comments on controllers would be welcome.

Thanks!
Dave





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