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05-30-2003 03:55 AM
05-30-2003 03:55 AM
RAID 3/5?
My understanding is that RAID 3 is striping with a dedicated parity disk, while RAID 5 is striping with distributed parity. What am I missing?
Thanks.
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05-30-2003 05:20 AM
05-30-2003 05:20 AM
Re: RAID 3/5?
You are correct about RAID 3 and RAID 5. You can read about "RAID Storagesets" in the manual for HSG80 (see page 2-23).
ftp://ftp.compaq.com/pub/products/storageworks/techdoc/acs/AA-RFBEJ-TE.pdf
As I can find RAID 3/5 uses distributed parity (and should be a RAID 5). I can't see the difference.
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06-02-2003 12:15 AM
06-02-2003 12:15 AM
Re: RAID 3/5?
Both Raid levels stripe over multiple disks. The difference is in the placement of the parity data. R3 has a dedicated parity disk while R5 distibutes parity over all disks.
R3 is optimal for sequential data while R5 is better for random access.
Read more in the attached doc.
Cheers
Peter
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06-02-2003 12:25 AM
06-02-2003 12:25 AM
Re: RAID 3/5?
RAID 3/5 is ONE RAID level. RAID 3 has an excellent data rate but poor request rate, on the other hand, RAID 5 has excellent read performance but moderate write performance.
If the controller is able to handle both parity generation schemes of RAID 3 and RAID 5, and uses them in case of advantage, the combination of them gives better write throughput overall compared to the pure RAID 3 or RAID 5 implementations. It is just the best out of both RAID levels.
HTH,
Vince
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