Promise U/33 support is native in 2.0.35 and up. I am thinking about another one for
a total of 8 drives housed in an old case. That's +100GB for about $2K US.
******
ide: i82371 PIIX (Triton) on PCI bus 0 function 33
ide0: BM-DMA at 0xd800-0xd807
ide1: BM-DMA at 0xd808-0xd80f
ide: Promise Technology IDE Ultra-DMA 33 on PCI bus 0 function 88
ide: Enabling DMA for Promise Technology IDE Ultra-DMA 33 on PCI bus 0 function 88,
port 0xa400
ide2: BM-DMA at 0xa400-0xa407
ide3: BM-DMA at 0xa408-0xa40f
hda: Maxtor 88400D8, 8011MB w/256kB Cache, CHS=1021/255/63, UDMA
hdb: ASUS CD-S340, ATAPI CDROM drive
hdc: YAMAHA CRW4416E, ATAPI CDROM drive
hde: IBM-DHEA-36481, 6197MB w/472kB Cache, CHS=12592/16/63, UDMA
hdf: IBM-DTTA-371440, 13783MB w/462kB Cache, CHS=28005/16/63, UDMA
hdg: IBM-DHEA-36481, 6197MB w/472kB Cache, CHS=12592/16/63, UDMA
hdh: IBM-DTTA-371440, 13783MB w/462kB Cache, CHS=28005/16/63, UDMA
ide0 at 0x1f0-0x1f7,0x3f6 on irq 14
ide1 at 0x170-0x177,0x376 on irq 15
ide2 at 0xb800-0xb807,0xb406 on irq 10
ide3 at 0xb000-0xb007,0xa806 on irq 10 (shared with ide2)
******
Note the promise uses 1 IRQ but has two separate UDMA controllers. Interleaving
yields double performance:
[tim@asus tim]# rpm -qa | egrep 'raid|kernel-2'
kernel-2.0.36-3
raidtools-0.50beta10-2
[tim@asus tim]# cat /proc/mdstat
Personalities : [1 linear] [2 raid0] [3 raid1]
read_ahead 8 sectors
md0 : active raid0 hde7 hdg7 6345600 blocks 16k chunks
md1 : inactive
md2 : inactive
md3 : inactive
[tim@asus tim]# hdparm -tT /dev/hd{e,g}7 /dev/md0
/dev/hde7:
Timing buffer-cache reads: 64 MB in 0.58 seconds =110.34 MB/sec
Timing buffered disk reads: 32 MB in 4.09 seconds = 7.82 MB/sec
/dev/hdg7:
Timing buffer-cache reads: 64 MB in 0.58 seconds =110.34 MB/sec
Timing buffered disk reads: 32 MB in 4.09 seconds = 7.82 MB/sec
/dev/md0:
Timing buffer-cache reads: 64 MB in 0.60 seconds =106.67 MB/sec
Timing buffered disk reads: 32 MB in 2.12 seconds =15.09 MB/sec
[tim@asus tim]#
Write speed isn't too shabby either:
[tim@asus]$ /usr/bin/time dd if=/dev/zero of=/raid/test50mb bs=1024 count=51200
51200+0 records in
51200+0 records out
0.04user 1.44system 0:03.89elapsed 38%CPU (0avgtext+0avgdata 0maxresident)k
0inputs+0outputs (83major+11minor)pagefaults 0swaps
[tim@asus]$ lsl /raid/test50mb
-rw-r--r-- 1 tim users 52428800 Mar 29 21:30 /raid/test50mb
[tim@asus]$ echo "52428800/3.89" | bc -q
13477840
[tim@asus]$ rpm -qa | egrep 'raid|kernel-2'
kernel-2.0.36-3
raidtools-0.50beta10-2
Rgds,
tim.
[EMAIL PROTECTED] wrote:
>
> Hi everyone,
>
> I see that Promise Technology actually has some IDE raid cards, and even a
> motherboard with one built-in.
>
> I'm assuming linux doesn't have any support for that, correct?
>
> Does it at least support the Promise Ultra33 card, to enable use of more than 4
> IDE drives in a system?
--
[Replies: add tim in front]
"Everything is permitted. Nothing is forbidden."
WS Burroughs.
