Messages in this thread | | | Date | Wed, 9 Dec 1998 09:30:34 +1000 (AEST) | From | Leonard Zhang System Administrator ISD RVIB <> | Subject | Re: Dumb question: Which is "better" SCSI or IDE disks? |
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I don't know if RAID-1 can mirror two DIFFERENT type of disks:-)
It is very difficult to find exact weight of dogs in different species :-)
I am dealing with the real world. I have no time to set up machines to make the so called benchmark test. Somebody wanted me to "measure" instead of my "think". So I made a random "measure". I don't want to establish the bench mark.
Leonard
On Tue, 8 Dec 1998, Damien Miller wrote:
> On Tue, 8 Dec 1998, Leonard Zhang System Administrator ISD RVIB wrote: > > > RAID-1 is disk mirror. DPT is cache with RAID. RAID will increase the > > disk performance. > > RAID-1 slightly *decreases* write performance, as writes will > complete only after data is written to all disks in the mirror > group. Writes therefore proceed at the speed of the *slowest* disk of > the array. RAID-1 should increase read performance, however. > > In any case I would hardly call a poorly conceived and statistically > irrelevant 'benchmark' valid, especially when performed under SCO. > > DPT controllers come with a lovely manual which explains in great > detail SCSI, RAID, tagged queueing and all the other basic concepts > that you have demonstrated an inability to comprehend. Please > read it, as these are concepts that every self-proclaimed "System > Administrator" should understand. > > > On Mon, 7 Dec 1998, Alan Cox wrote: > > > > > > Open server 5.0.4p, DPT RAID-1, 32 MB cache, PCI, 4.2 GB (A cable) > > > ^^^^^^^^^^^^^^^^^^^^^ > > You still haven't explained why you are trying to compare SCSI disk > performance under SCO with that of IDE disks on Linux. (Free Clue - > you can't). > > Regards, > Damien Miller > > | Damien Miller - > | Email: dmiller@ilogic.com.au (home) or damien@ibs.com.au (work) > | WWW: http://www.ilogic.com.au/~dmiller/ > >
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