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02-20-2008 05:22 PM - last edited on 04-21-2015 01:06 AM by Maiko-I
02-20-2008 05:22 PM - last edited on 04-21-2015 01:06 AM by Maiko-I
Raid 0+1 VS Raid5
I have a new MSA1500CS, filled with 6 300GB drives.
With a Raid 5 I get about 1400GB
With a Raid 0+1 I get about 830GB
What are the performance differences with going with raid 0+1. Is there any HP docs that can help with these details.
Thanks in advance
P.S. This thread has been moved from General to Storage Area Networks (SAN) (Small and Medium Business). - Hp Forum moderator
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02-20-2008 06:03 PM
02-20-2008 06:03 PM
Re: Raid 0+1 VS Raid5
Basically, with RAID 0+1 ech block is written to two different disks. Therefore you get about half the space available.
With RAID 5 a block is only written to a single disk and then a parity block is written for every set of 5 blocks. Therefore you get more usuable space.
e.g. 5/6 of the raw space is available.
Raid 0+1 is usually faster. each write requires 2 writes. With Raid 5 the parity needs to be recreated so each write requires 2 reads + 2 writes.
For reads the performance is much closer. Generally 1 read only requires a single disk access.
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02-21-2008 04:21 AM
02-21-2008 04:21 AM
Re: Raid 0+1 VS Raid5
it depends on you use case. If you're using heavy load databases you should use RAID 1+0. If you're serving files, then you should use RAID 5. RAID 5 needs 2 read and 2 write IOs for one (logical) write IO.
Take a look at this:
http://en.wikipedia.org/wiki/RAID
Hope this helps.
Best regards,
Patrick
Patrick