kjc@and.cs.liv.ac.uk (05/27/91)
I am trying to find out the recommended interleave factor for the disk drives listed below. They don't appear to be in our version of disktab which came with HPUX 7.0. HP7959S (SCSI) HP2203A (HPIB) HP2213A (SCSI) RodimeRO3000T (SCSI) In fact looking through disktab, non of the SCSI drives have this information - is there any reason for this? Any help would be appreciated. Thanks in advance. Kenny Chan postal: Kenneth Chan Computer Science Dept. University Of Liverpool PO Box 147 Liverpool L69 3BX. email: kjc@uk.ac.liv.cs.and
kinsell@hpfcdj.HP.COM (Dave Kinsell) (05/31/91)
>I am trying to find out the recommended interleave factor for the disk drives >listed below. They don't appear to be in our version of disktab which came >with HPUX 7.0. > > HP7959S (SCSI) > HP2203A (HPIB) > HP2213A (SCSI) > RodimeRO3000T (SCSI) >In fact looking through disktab, non of the SCSI drives have this information - >is there any reason for this? The disktab entries don't include interleave information unless something other than the default value is optimal. Newer disk drives all have the capability of reading and writing contiguous sectors, so the default value (which is contiguous sectors) works fine. All of the SCSI Winchesters work best with the default. In fact, most SCSI mechanisms will ignore other values that you attempt to use when formatting them. Things get more interesting at 8.0, where drives are supported that can handle more aggressive file system tuning to deliver higher throughput than was possible in the past. Comments have been added to the various disktab entries indicating how to change the file system tuning to optimize performance. The install process has been modified to allow tuning to be changed before installing an OS to a disk. This applies to the 68K 8.0 release, I'm not familiar with what's happening for S800. >Any help would be appreciated. >Kenny Chan Regards Dave Kinsell kinsell@hpfcmb.hp.com