Hello, I have another (probably stupid) problem. A server is running
a Micronics M6Me mainboard with integrated SCSI. I want to add extra
drive(s) into a RAID0 of aging Seagate Elite 9GB `bricks', and thought
that I might make do with a 7200rpm Fujitsu MPE (13GB UDMA-66) as the
third drive in the RAID, perhaps in a RAID-4. It is only after being
all done with the backing-up, re-set-up, and so on that I realised the
unfortunate fact that the M6Me, like earlier server boards such as the
SuperMicro P6DOF, has its IDE drives connected to the ISA bus -- good
for maybe 1.5 MB/s in PIO mode, no DMA. No problem, said I, I have a
Promise PCI UDMA66 controller lying around. In it went and I was able
to find and set up with my Fujitsu as /dev/hde on the ide2 interface.
But OUCH!! when I try to do enable DMA, I get this:
[root@titania /root]# /sbin/hdparm -d 1 /dev/hde
/dev/hde:
setting using_dma to 1 (on)
HDIO_SET_DMA failed: Operation not permitted
using_dma = 0 (off)
[root@titania /root]# /sbin/hdparm -i /dev/hde
/dev/hde:
Model=FUJITSU MPE3136AH, FwRev=EH-A2-25, SerialNo=00010231
Config={ HardSect NotMFM HdSw>15uSec Fixed DTR>10Mbs }
RawCHS=26467/16/63, TrkSize=0, SectSize=0, ECCbytes=4
BuffType=0(?), BuffSize=2048kB, MaxMultSect=16, MultSect=off
DblWordIO=no, maxPIO=2(fast), DMA=yes, maxDMA=0(slow)
CurCHS=1660/255/63, CurSects=428343703, LBA=yes
LBA CHS=830/510/63 Remapping, LBA=yes, LBAsects=26679688
tDMA={min:120,rec:120}, DMA modes: mword0 mword1 mword2
IORDY=yes, tPIO={min:120,w/IORDY:120}, PIO modes: mode3 mode4
UDMA modes: mode0 mode1 mode2
Can someone point to a reason why enabling DMA might fail? I'd been
under the impression that UDMA-66 controllers offer all functionality
of common IDE DMA controllers, plus more. I tried this starting with
the IDE interfaces disabled or enabled, no difference. THANKS!
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This archive was generated by hypermail 2b29 : Wed Mar 15 2000 - 21:00:21 EST