Hi, Glenn, on Donnerstag, 03. Juni 2004 at 06:51 you wrote to amanda-users:
GE> Jon implied that hdparm may be just kidding about this. hdparm -Tt gives GE> the following: GE> ---- GE> /dev/hda: GE> Timing buffer-cache reads: 2800 MB in 2.00 seconds = 1399.51 MB/sec GE> Timing buffered disk reads: 82 MB in 3.00 seconds = 27.33 MB/sec GE> /dev/hdc: GE> Timing buffer-cache reads: 2772 MB in 2.00 seconds = 1386.21 MB/sec GE> Timing buffered disk reads: 114 MB in 3.03 seconds = 37.62 MB/sec GE> ---- GE> Since I have no feel for what pio would be like, I don't know. But the GE> difference looks ballpark right for the different dma modes. pio looks different ;-) Would be much slower. GE> I looked at another system: an old Dell server downstairs with a Maxtor GE> PCI IDE card and a 2 or 3 year old Maxtor 60GB disk, also claiming to be GE> udma5: GE> ---- GE> /dev/hde: GE> Timing buffer-cache reads: 128 MB in 0.59 seconds =216.95 MB/sec GE> Timing buffered disk reads: 64 MB in 1.59 seconds = 40.25 MB/sec GE> ---- GE> Something is wrong here. The disks up here are much newer, and a lot GE> slower. I'm using the onboard controllers in an Intel D865GLC GE> motherboard. Getting away from AMANDA-topics: You should get your IDE-setup straight. A main point is the bus-mastering. It is also very important to performance which device is the master and which is the slave on your ide-bus. You have hda and hdc here, which are the primary and secondary master-drives on your first (only?) IDE-controller. This is good so far, but you should also enable bus-mastering for you controller. Are there other drives at hdb and hdd ? Often these are used for CD-ROM-drives. If you REALLY want to get the best IDE-performance, don't use any slave-drives. Put in a second IDE-controller (25 bucks maybe) and let the faster controller control the disk drives as master drives. One device per IDE-channel, so you would get maybe hda disk drive hdc disk drive hde cd-rom no more slaves. GE> Does anyone know of an equivalent to hdparm -Tt for SCSI disks? Look at bonnie and bonnie++ maybe, they will test overall disk performance. -- best regards, Stefan Stefan G. Weichinger mailto:[EMAIL PROTECTED]