Re: Problems with Promise PDC 20265 raid on ASUS Motherboard
--- Henrique de Moraes Holschuh <hmh@debian.org> escribió:
>
> If your RAID HW controller was a top-notch one, with lots of buffers and a
> proper HW engine... maybe. But el-cheap-o Promise PDC20265 is worth very
> little (I have an Asus A7V with a PDC20265. I talk from experience).
>
> The RAID HW controllers I have used (Intel SCRU32 with 64MB cache and IBM
> serverRAID with (I think) also 64MB cache) were not much faster when doing
> raid 1 (these are SCSI disks, though, and tagged queues make a lot of
> difference). They were better for RAID5, though. And these are high-end,
> proper HW RAID controllers talking to SCSI-160 disks.
[SNIP]
> If you have two disks, one in each channel of your PDC20265, running in
> UDMA100, it *is* faster to use Linux software RAID in my experience (Asus
> A7V, 256MB PC133 SDRAM, Athlon Thunderbird 1.2GHz).
>
> If you doubt it, test it. Don't buy the "HW must be better than software"
> crap, it is only true if you use the proper HW. And the PDC20265 ain't one
> when compared to a fast processor and a proper OS with enough RAM.
> Actually, it ain't a proper RAID HW controler at all in my book.
Point taken. I don't have much experience with high end hardware and only
very limited experience (one machine at school w/ Promise RAID 20276) with
RAID. About the most "high-end" hardware I've worked on is a grey box with
an Athlon, running Woody, and hooked up to an UPS. Thanks for the insight.
-Roberto
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