Make sure your kernel supports the promise IDE chipset. CONFIG_BLK_DEV_PDC202XX, CONFIG_PDC202XX_BURST, and CONFIG_PDC202XX_FORCE in the "IDE, ATA and ATAPI Block devices". This is in addition to enabling CONFIG_BLK_DEV_ATARAID_PDC below. If that doesn't work, just add the approprate hdparm command to your startup scripts. Scott Bartlett Thu, 14 Feb 2002, Ed Schernau wrote: > Hello all, > > I have Liunx 2.4.17 with a Promise FastTrak TX2, and 2 WD 40GB ATA100 disks > in a RAID0 stripe set. It works wonderfully - "modprobe pdcraid" and Linux > sees them no problem. I used Linux FDISK to make the partitions, and can see > all partitions from both Linux and Win2000 (dual boot, from separate disk). > > /dev/hde never gets programmed for DMA, multicount, and both disks were in > mode "68" which is not ATA-100 speed. I get some "drive not ready errors" in > /var/log/messages, but my data is fine (weird!). Manually setting the speed > settings with hdparm like so: > > hdparm -m16 -d1 -X69 /dev/hde, and > hdparm -X69 /dev/hdg makes them identical from a /proc/ide/hd[e,g]/settings > perspective. > > Simply turning on DMA for /dev/hde makes the error messages go away. > > Three questions: > Any ideas why this does not automatically get set at boot? > Also, any idea why each drive shows a radically different CHS geometry? > What does "CANNOT DECODE HOST" mean in the /proc/ide/pdc202xx file? > > Ed > > PS For the curious, tiobench data: > > [Ed@tempinstall tiotest-0.26]$ ./tiobench.pl --size 1024 --dir /mnt/raid/test > Size is MB, BlkSz is Bytes, Read and Write are MB/sec, Seeks are Seeks/sec > > Dir Size BlkSz Thr# Read (CPU%) Write (CPU%) Seeks (CPU%) > ----- ------ ------- ---- ------------- -------------- -------------- > /mnt/ 1024 4096 1 44.2241 26.0% 39.2536 34.3% 152.126 1.29% > /mnt/ 1024 4096 2 29.9385 18.6% 38.0826 33.3% 178.977 1.23% > /mnt/ 1024 4096 4 29.5640 19.2% 38.6084 33.9% 198.879 1.29% > /mnt/ 1024 4096 8 27.6160 17.9% 38.4465 34.0% 213.668 1.33% > > > > _______________________________________________ > > Ataraid-list@xxxxxxxxxx > https://listman.redhat.com/mailman/listinfo/ataraid-list >
