Artem Kuchin wrote:
Marc G. Fournier <[EMAIL PROTECTED]> wrote:
For the last 6 month i really think that if you don't need something
high-end scsi then you should go for SATA.
Fair enough if you don't need high-end yoy shuld go lowend. But read on..
There are test on sites such as
Tom's hardware guide and ixbt.com. They show then on sequrncial read
there is no difference between scsi and sata.
That is a well known fact. It is also a totally useless parameter for
server use.
Acatuallty, modern hdds use the same mechanics for sata and scsi
> versions of them. The brains
This is simply not true. There were a couple of drives about 10yrs ago
where this was true eg. Quantum Lightning which were available in both
IDE and SCSI
Todays SCSI drives have _nothing_ in common with SATA/ATA drives.
However, when it comes to random read/writesscsi wins because of
> command queueing.
And faster accesstime and higher rotational speed (lower latency) you
simply can't compare a 7200rpm drive to a 15000rpm drive no matter what
interface it has.
Recently SATA with NCQ became widly available. Test show that some of those
SATA disks with NCW ***WIN*** over scsi 320.
To use NCQ drive, controller and OS needs to support it, only a few
controllers supports NCQ and FreeBSD have no support at all!
The test envolve artificialy randomread/write tests as well as
> real application benchmarking. I din't rememeber where
excatly i saw the tests on those site, but you could search.
The tests on tomshardware are windows single user centric, they never
test server workloads, their audience are kids who plays games...
So, my opinion, workstation never needs SCSI and every server MUST be on
mirror or RAID5 and there you should use SATA with NCQ drivers unless,
your applicaton is really weird and needs something extremely speedy.
Then, however,
you could go for RAID 0+1 and get perfomance that SCSI will never get you.
Want something cheap with lots of space? SATA
Want something that works and is fast? SCSI
Using SATA for databases and mailservers is going to give you bad
performance.
Regards,
Martin
--
Martin Nilsson, CTO & Founder, Mullet Scandinavia AB, Malmö, SWEDEN
E-mail: [EMAIL PROTECTED], Phone: +46-(0)708-606170, Web: www.mullet.se
Our business is well engineered servers optimised for FreeBSD & Linux
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