On Tuesday 10 Sep 2002 11:00 am, Tom Brinkman wrote: > If I understand your statement... yes. Even if the drive is set to > ata/100 (udma5), and all other requirements are good to go, if the > proper 80w cable is not used, the drive will default to ata/33. As to > your arrangement, IME you might be better off putting, or at least > tryin both hardrives on ide0 (primary channel), and the cd-rw on ide1 > (secondary channel). Keep the non?-80w cable on ide1 (secondary) for > the cd-rw, use your 80w cable for the harddrives on ide0 (primary). If > you didn't have a CDr drive, or if you had more ide channels, then what > you've read about putting HDD's on separate channels is true.
After changing the drive to ide0 as slave, I got ata100 and tr results are as follows. [root@localhost lvgandhi]# hdparm -Tt /dev/hdb /dev/hdb: Timing buffer-cache reads: 128 MB in 1.42 seconds = 90.14 MB/sec Timing buffered disk reads: 64 MB in 1.54 seconds = 41.56 MB/sec Previously it was [root@localhost HDDdetails]# hdparm -Tt /dev/hdc /dev/hdc: Timing buffer-cache reads: 128 MB in 1.34 seconds = 95.52 MB/sec Timing buffered disk reads: 64 MB in 2.27 seconds = 28.19 MB/sec Thanks for the advice. > no 32bit support, needs 'hdparm -c1 /dev/hda' Think of it in terms > of a highway. In light traffic, a 2 lane road can handle as many > vehicles as a 4 lane. But come rush hour, the more lanes the better ;) > Right now you've got 16 lanes, you need to enable 32 lanes. After changing it to c1, I didn't find any improvement in rates. Further hdparm -I /dev/hdb gives as r/w multiple sector transfer: Max = 16 Current = 16 Whether this means that drive itself is capable of max 16bit not 32 bit. Hence no improvement in speed. Whether still you feel it is better to change it to -c1? > The saving grace here is the 7200rpms and 2mb buffer. Most 7200, > 2mb drives are udma5 capable tho, and then this number would be > 40+mb/sec. yes I could get it as given above. and also hdparm -I /dev/hdb gives as DMA: mdma0 mdma1 mdma2 udma0 udma1 udma2 udma3 udma4 *udma5 > For judging huge data > crunching (video editing?) capability you might wanna look at some > benches like 'bonnie'. Any pointer please? -- L.V.Gandhi 203, Soundaryalahari Apartments, Lawsons Bay colony, Visakhapatnam, 530017 MECON, 5th Floor, RTC Complex, Visakhapatnam AP 530020 INDIA
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