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Re: [K12OSN] Linux "Software RAID"



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On Aug 9, 2008, at 4:05 PM, Terrell Prude' Jr. wrote:
I use RAID 5 in 14-disk arrays at work. We find the speed excellent, and the savings in disk space is enormous. Say you have fourteen 500GB disks, be they SATA or SCSI. With RAID 10, your storage would be 14 disks * 500GB / 2, which is 3.5TB. With RAID 5, you'd have (14 disks - 1 for parity) * 500GB = 13 * 500GB = 6.5TB. I'll take the extra 3TB any day!

--TP


This is true, although in an array that big you might consider RAID 6 instead. RAID 5 cannot handle more that one disk failure at once. Whereas a RAID 10 with 14 disks could lose one disk in each pair and still not fail (up to 7 in this case). But like you said, the downside is lost disk space. It's just that disk space is so cheep these days, especially with LVM, that I don't worry much about giving it up. A pair of 6 disk Raid 10 arrays in LVM would be pretty outstanding I think. -----BEGIN PGP SIGNATURE-----
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