Re: [opensuse] Re: [OT] vmware and fake scsi devs

Chris Worley wrote:
On Dec 4, 2007 10:22 AM, Jc Polanycia <JC.Polanycia@xxxxxxxxxxxx> wrote:
Off topic, as I seldom partition anything (unpartitioned drives
perform best), but, you're setting yourself up for disaster using LVM
(any corruption to the LVM layer is not recoverable... you'll loose
everything... been there done that), and the performance is poor, and
MD RAID5/6 devices can be grown (add more disks).

Chris

Fair enough. I appreciate the input because I haven't run across any
real-world stories about LVM corruption. I have personally encountered
corruption problems with RAID5/6 as well as problems with decreased
performance as a RAID5 structure gets more members added to it.

I saw some RAID6 issues last year, so I use RAID5... but recent tests
have shown MD RAID6 as solid.

"Decreased performance as more members get added to it"? Bull!!! I'm
guessing you have another bottleneck that has led you to this
conclusion.

While the performance increase doesn't scale linearly as disks are
added (some CPU verhead is added with each additional drive), the more
disks, the better the performance. I'm sure there is some Amdahl's
law limit to the increased performance scalability, but I run RAIDS up
to 12 drives, and see performance added w/ each new member.


You're hallucinating. That defies basic information theory.

Your assertion is akin to suggesting that you power your
computers with a perpetual motion machine (despite the
fact that such would violate the 1st, 2nd, and 3rd laws
of thermodynamics).


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