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- Newsgroups: comp.sys.hp
- Path: sparky!uunet!netnews!warper.jhuapl.edu!trn
- From: trn@warper.jhuapl.edu (Tony Nardo)
- Subject: Re: Third party disk drives on HP-UX
- Message-ID: <trn.715289167@warper.jhuapl.edu>
- Keywords: HP-UX disk drive 3rd third party
- Sender: usenet@netnews.jhuapl.edu
- Organization: JHU/Applied Physics Laboratory
- References: <1992Aug29.191511.29259@riacs.edu>
- Date: Mon, 31 Aug 1992 19:26:07 GMT
- Lines: 51
-
- okuyama@pioneer.arc.nasa.gov (Darin Okuyama YR) writes:
-
- >Has anyone successfully installed a thrid-party SCSI disk
- >dirve on a Snake (HP 9000/700)?
-
- I installed a pair of disks from ADS (contained 2 Seagate ST41600N Elite
- drives, each with ~1.3 Gbytes storage). So far they seem to work.
-
- >If you have, then:
-
- > (1) Was it relatively straightforward?
-
- Moderately. The hardest part was researching the drive's operating
- parameters (i.e. # of sectors, # of tracks, # of cylinders). Beyond that,
- SAM gave me the info I needed to add support for the drive. SAM will tell
- you which files to modify so that you may add a new "Disk drive model" to
- the system.
-
- > (2) What problems did you encounter?
-
- I lost roughly 7% of the usable space on my disk due to the assumption by
- HP that all drives will have 1024-byte sectors. They provide a workaround
- solution for those who have 512-byte sectors so that you may still use the
- drive. However, a disk with an odd number of 512-byte tracks will lose one
- track under the workaround.
-
- I did not have access to the rotational speed of my drive, but 3600 seemed to
- be a fairly common number. I used that, and it worked. Whether I guessed
- correctly or whether the HP driver no longer uses this information, I cannot
- say.
-
- > (3) What advice can you give the Net?
-
- 1) Have your drive's documentation available to determine the # of tracks,
- sectors, & cylinders. If you don't have this documentation, but you have
- a similar model drive on a Sun, you can obtain this information with the
- "dkinfo" command. Other flavors of Unix may offer similar ways to
- inspect disk information on other systems.
-
- 2) Obtain the rotational speed of the drive. (I was willing to take a
- chance on 3600, lacking the proper number, but this may not be a good
- idea.)
-
- 3) Use SAM to add the disk drive. The files you need to modify are well
- documented, and SAM tells you which files you'll need to change. (Those
- files, BTW, are /usr/sam/lib/disk_aliases and /etc/disktab.
-
- Good luck!
- --
- Tony Nardo, INET: trn@warper.jhuapl.edu, trn@aplcomm.jhuapl.edu
- Johns Hopkins Univ./APL UUCP: {backbone!}mimsy!aplcomm!trn
-