Re: RAID bus controller: Promise Technology, Inc. PDC20376 (FastTrak376) (rev 02)
I got 2 new SATA drives and pluged them into the onboard Promise
PDC20376 (FastTrak 376) and run badblocks on them (both in
parallel). The write test completed fine but read&compare locked up my
I repeated with a read-only test and again it locked up with an DMA
Does anyone have the onboard Promise successfully in use on an Asus
My experience is now negative for the Promise controller
under linux for the Promise mirroring mode.
Writing to the SATA sda2 with an ext2 filesystem was not
mirrored to the hidden PATA at all. The Promise controller
did not notice the discrepancy and did not want to rebuild
the array nor permit rebuilding when prompted.
I think this is a failure of the Promise controller to cope
with the ext2 filesystem or perhaps to more than one
partition without regard to the way the sata_promise driver
writes to the array.
There was no way found to mirror less than a full disk.
The disks are handled differently by DOS and Linux under
the current sata_promise driver. The DOS makes two disks
available when mirroring is turned off and one disk when
mirroring is turned on. Linux now presents one disk whether
mirroring is on or off. The new 2.6.11 is supposed to
contain changes in the way the disks can be accessed.
I don't think the Promise controller can natively cope with
ext2 filesystems and probably many more. The Promise
controller says the array is functional when the mirror is
bad. My tests showed the RAID was not mirroring at all
while saying the array was functioning properly.
If my testing was accurate, the Promise controller fails
in mirroring and the native RAID features are unusable for
Linux. I have no information about the striping features.
I have no plans to use the native Promise RAID modes in the
future. They have limited capability to offer and failed in
serious ways during my several installations.
The native Promise RAID mode is now a big turn off.
AMD Athlon64 @2.4Ghz Corsair TwinX1024-3200XL @480Mhz DDR
ASUS A8V Deluxe ASUS Radeon A9250Ge/Td/256
Creative SB Live WD Raptor SATA Maxtor PATA IBM/Okidata
Color PostScript3 Lexmark Mono PostScript2
Debian GNU/Linux debian-amd64/pure64 sid Kernel 2.6.10
XFree86 4.3.0 Xorg X11R6.8.2 1.5 Mb DSL