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Re: [K12OSN] server capable ?



van Gemmern wrote:

Hi all,

I´ve read on the latest german c´t about RAID-tests. They´re talking
that there is no really necessairy in using an expansiv hardware controler
neither SCSI disks. The price<->speed solution is using software RAID5. Only
for speed using RAID10. This must be done in Linux at all.


This is correct, but only for serial data - where the drive is reading data from one location only.


It is an entirely different situation when the drive is used for near-random access - where the drive is reading data from all over the platter(s). In this situation, SCSI drives do not lose performance as quickly as IDE drives.

Lightly loaded IDE drives will perform nearly as well as SCSI drives, but heavily loaded, the SCSI drive has a much higher threshold before thrashing sets in, and server performance rapidly degrades to near unusable.


/steve







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