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RAID Questions
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Professional Poster
Join Date: Apr 2002
Location: New York City
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Offline
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I've got a fair amount of experience with large capacity SCSI RAIDs. These are generally 6 or more drives, all of the same model. I need to get a big fat external drive and I'm thinking of getting the WiebeTech DuoGB and sticking a pair of 120 GB IBM (hatachi) DeskStar drives in it and striping them into a 240 GB array.
First of all, does this make any sense? Will it offer any speed benefit to do a software RAID over FireWire, or should I just keep the drives formatted separately?
Secondly, I already have 1 120 GB DeskStar drive, but nobody carries a drive with the same part number anymore. Is it possible/adviseable to stripe two different model drives into one array?
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Forum Regular
Join Date: Jan 2003
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Mac Elite
Join Date: Apr 2002
Location: Here and there
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No it doesn't make any sense to have a Firewire RAID 0... well, maybe not any but not a lot.
Firewire is limited to 400 MBit/s, in theory that's 48MB/s. One single 120GB harddrive may already be too fast, nowadays harddrives transfer up to 45MB/s. Hence two harddrives would need 90 MB/s therefore you need at least UDMA100 for it to make sense.
It might be ok though if you connect them to different Firewire buses, that would mean you had 400 MBit for each harddrive.
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"Life is not a journey to the grave with the intention of arriving safely in one
pretty and well preserved piece, but to skid across the line broadside,
thoroughly used up, worn out, leaking oil, shouting GERONIMO!"
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Mac Elite
Join Date: Aug 2001
Location: Madison, WI
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Separate.
If you have 2 drives and use them as 2 drives, and one fails, you've lost the content of one drive.
If you have 2 drives striped to act as one, and one fails, you've lost the content of 2 drives.
Given a long enough timeline, one of the drives will fail. Drives basically stink. If they didn't we wouldn't have concepts like RAID 3 and 5 around.
Of course, if you're religious and good about backups, then this isn't an issue. But few of us are *that* good about backups.
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OS X: Where software installation doesn't require wizards with shields.
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Admin Emeritus  Join Date: Oct 1999
Location: Zurich, Switzerland
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Yup. Striping without parity is extremely hazardous to your data!
tooki
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