Joined: 14 Jan 2007 Posts: 46 Location: on the couch
Post subject: Posted: Sun Mar 04, 2007 3:34 am
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A spanned volume extends a single volume across a number of disks - but it's linear. Ie - it writes data to the first disk, when that's full it writes to the second disk, then to the third or fourth disks - if it's spanned over a number of disks. It's flexible because you can add disks to the span quite easily. There's no performance benefit to it.
A striped volume writes 1/2 of each file to each disk. The benefit is that it's a lot quicker in some situations as each physical disk only gets 1/2 the data to write.
If you stripe across 5 disks then a 1mb file writes 200k to each disk.
Joined: 14 Jan 2007 Posts: 46 Location: on the couch
Post subject: Posted: Mon Mar 05, 2007 5:33 am
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yep. no fault tolerance on either. You don't see spanned volumes in production much - except for JBOD. Striped sets are pretty common when speed is an issue but resilience isn't.
These things come up in exams sometimes and is just generally good to understand - what kind of data is appropriate on what kind of volume. Generally logs are good on striped sets as they can be write-intensive and it's not the end of the world if you lose them, but real data should be a on fault-tolerant drive.
Joined: 04 Oct 2003 Posts: 182 Location: West Africa
Post subject: Posted: Mon Mar 05, 2007 8:03 am
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...However, one scenario commonly seen in production is the use of a fault tolerant striped set (called RAID 10), meaning that you create a striped set on, say 5 drives, and then you mirror it... In this case, what could easily become an issue is the disk drive cost... _________________ Phil
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Joined: 07 Feb 2005 Posts: 152 Location: Oklahoma,USA
Post subject: Posted: Mon Mar 05, 2007 9:44 am
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Skull wrote:
...However, one scenario commonly seen in production is the use of a fault tolerant striped set (called RAID 10), meaning that you create a striped set on, say 5 drives, and then you mirror it... In this case, what could easily become an issue is the disk drive cost...
3 or more Disks in a Striped set would classify as a RAID 5 and That sounds like a RAID 5 to me. _________________ Josh
A+,Network+,CCNA (Expired),MCSA 2000,DCSE
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Joined: 04 Oct 2003 Posts: 182 Location: West Africa
Post subject: Posted: Mon Mar 05, 2007 10:17 am
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[quote="visualicon2002]3 or more Disks in a Striped set would classify as a RAID 5 and That sounds like a RAID 5 to me.[/quote]
3 disks would of course be elligible for a RAID 5, but keep in mind that you still lose one drive's space, meaning there is really no fault-tolerancy here if you are to face a disk problem later.
My above suggestion (RAID 50), if you want both fault-tolerant and fast disk writing capabilities, works with a minimum of 4 drives (two, being the minimum for a striped set, and the other two for mirroring the set). _________________ Phil
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Joined: 03 Mar 2007 Posts: 14 Location: Clever, MO
Post subject: Posted: Thu Mar 08, 2007 1:58 am
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Actually they go over RAID 1+0 and RAID 0+1 in the Server+ Exam Cram book. I thought it sounded pretty cool myself.... _________________ A+, Network+, MCP (Win2k Pro)
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