Tom, Thanks for the infomation.
Tom Brinkman wrote: > On Wednesday October 2 2002 10:06 am, J. Grant wrote: > >>Have you all optimised your new drives so they dont run in 16bit >>mode? >> >>http://linux.oreillynet.com/lpt/a/272 >> >>hdparm -d1 -u1 -m16 -c3 /dev/hdg works a treat on my drive. >> >>I found that if i messed with -X it made it go slower, the bios sets >>the disk up as UDMA 2 already. and that -c3 is the saver version of >>-c1 > > > info hdparm: "The value 3 works with nearly all 32-bit IDE > chipsets, but incurs slightly more overhead." So unless you need 3, > or find it actually does improve HDD performance, use -c1. Use > 'hdparm -i /dev/hdx' to see what the drive is capable of, eg, > UDMA modes: udma0 udma1 udma2 udma3 udma4 *udma5 udma6 -c1 might be a little dangerous considering everyones comments about WD. -c3 is still reasonable. > udma2 is awfully slow. udma5 needs a ata/100 controller, udma6 needs > a /133. In my UDMA example, it's an ata/133 drive on a /100 mobo. udma2 is the fastest that is supported apparently > Take a look in /etc/sysconf/harddisks You can specify hdparm > options there instead of rc*. Doesn't work for CD drives tho, only > HDD's. /etc/sysconf/harddisks It appears to be for all drives with no specific options for each one. JG see below it does not give out the standards compliance mode # hdparm -i /dev/hde /dev/hde: Model=WDC WD800BB-00CAA1, FwRev=17.07W17, SerialNo=WD-WMA8E3405796 Config={ HardSect NotMFM HdSw>15uSec SpinMotCtl Fixed DTR>5Mbs FmtGapReq } RawCHS=16383/16/63, TrkSize=57600, SectSize=600, ECCbytes=40 BuffType=DualPortCache, BuffSize=2048kB, MaxMultSect=16, MultSect=16 CurCHS=16383/16/63, CurSects=16514064, LBA=yes, LBAsects=156301488 IORDY=on/off, tPIO={min:120,w/IORDY:120}, tDMA={min:120,rec:120} PIO modes: pio0 pio1 pio2 pio3 pio4 DMA modes: mdma0 mdma1 mdma2 UDMA modes: udma0 udma1 udma2 AdvancedPM=no WriteCache=enabled Drive conforms to: device does not report version: 1 2 3 4 5 # hdparm -Tt /dev/hde /dev/hde: Timing buffer-cache reads: 128 MB in 1.17 seconds =109.40 MB/sec Timing buffered disk reads: 64 MB in 2.04 seconds = 31.37 MB/sec [root@now1g now3d]# hdparm /dev/hde /dev/hde: multcount = 16 (on) IO_support = 0 (default 16-bit) unmaskirq = 0 (off) using_dma = 1 (on) keepsettings = 0 (off) readonly = 0 (off) readahead = 8 (on) geometry = 155061/16/63, sectors = 156301488, start = 0
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