Hi there, Am Donnerstag, 6. März 2003 20:48 schrieb Alan: > On Thu, Mar 06, 2003 at 02:41:20PM -0500, Ernie Schroder wrote: > > I'm getting ready to take Gentoo_2 off line and replace mobo and > > processor I was looking at hdd's this morning and saw Western Digital > > 80 and 120 gig udma 133 drives at both the same pricethe difference is > > that the 80 gig has 8 megs of cache and the 120 2gigs.both claim a seek > > ^^^^^ Gigs??? > > > time of 9.1ms. could some one voice an opinion here.(as if I have to > > look far on this list for an opinion :) ) Which would you buy? > > More cache is always better performance, but if it means you can get the > extra 40G.... Kinda hard to say. I got myself some of the WD 80G/8m > drives a couple of months ago and have been quite happy. There was a > bigger price difference between the 80 and 120 at that point though :) > > Tough decision, I guess it really comes down to space or performance. > Granted, I can't give you quantitative evidence of the performance of > the 8m vs 2m cache.
I have the WD 80G drive with 2MB Cache, so I will just post my values. > > My hdparm results: > > phoenix alan # hdparm /dev/hdf > > /dev/hdf: > 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 /dev/hda: multcount = 16 (on) IO_support = 1 (32-bit) unmaskirq = 1 (on) using_dma = 1 (on) keepsettings = 0 (off) readonly = 0 (off) readahead = 8 (on) geometry = 9729/255/63, sectors = 156301488, start = 0 > phoenix alan # hdparm -Tt /dev/hdf > /dev/hdf: > Timing buffer-cache reads: 128 MB in 0.80 seconds =159.60 MB/sec > Timing buffered disk reads: 64 MB in 2.07 seconds = 30.86 MB/sec /dev/hda: Timing buffer-cache reads: 128 MB in 0.50 seconds =256.00 MB/sec Timing buffered disk reads: 64 MB in 2.04 seconds = 31.37 MB/sec Quite strange that my cache reads are much faster, probably it's teh controller. > phoenix alan # dmesg | grep hdf > hdf: WDC WD800JB-00CRA1, ATA DISK drive > hdf: 156301488 sectors (80026 MB) w/8192KiB Cache, CHS=155061/16/63, > UDMA(100) Kernel command line: root=/dev/hda8 hdd=ide-scsi ide0: BM-DMA at 0xd400-0xd407, BIOS settings: hda:DMA, hdb:DMA hda: WDC WD800BB-53BSA0, ATA DISK drive hda: 156301488 sectors (80026 MB) w/2048KiB Cache, CHS=9729/255/63, UDMA(100) So it seems that in this small "benchmark" the cache doesn't score too much perhaps there are some better things to run like bonnie or dbench. Greetings Christian -- [EMAIL PROTECTED] mailing list