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- Newsgroups: comp.sys.hp
- Path: sparky!uunet!elroy.jpl.nasa.gov!sdd.hp.com!crash!wsmvax!root
- From: root@wsm.com (System Manager)
- Subject: Re: Hitachi 3.7Gb SCSI disks.
- Message-ID: <1993Jan23.004624.2305@wsm.com>
- Organization: Western Scientific
- X-Newsreader: Tin 1.1 PL4
- References: <7336@m1.cs.man.ac.uk>
- Date: Sat, 23 Jan 1993 00:46:24 GMT
- Lines: 78
-
- mbdtsmc@uts.mcc.ac.uk (M.D.Cooper) writes:
- : We have been offered some very cheap (by U.K. Standards) disks. They are Hitachi
- : 3.7 Gb SCSI drives and I've been assured by the salesman that there will be no
- : problem hooking them up to our HP7[235]0 cluster.
- :
- : Does anyone have any experience with these drives?
- :
- : Can anyone send me a disktab entry for them which will work?
- :
- :
- : Thanks in advance,
- :
- : Matt Cooper
-
-
- Dear Matt,
-
- BEWARE! The Hitachi DK-517C-37 disks will not work on the HP 9000
- 700 series systems running HP-UX.
-
- The 3.7GB drive has a capacity that exceeds the HP-UX's ability
- to compute things correctly like disktabs, bootfiles, etc...
-
- The creation of a bootfile doesn't work for instance if your
- loading HP-UX from tape for the first time. The install procedure
- looks at the drive and and reads the capacity. The returned number is
- so large that the number of 512b blocks * 512 chokes the math register
- that the Install procedure uses and replies...
-
- Cannot load HP-UX to disk drive of -55 MB Capacity
- You must use a minimum 120MB disk drive to load HP-UX
-
- How do you like that> -55 MB disk (Its a black hole, negative disk space)
- Its a really great physics trick if it were real.
-
- Anyhow I have been testing the DK-517C-37 for Hitachi on the HP9000/7xx
- with HP-UX 8.0.7 using SCSI bus analyzers and using SCSI Mode Select
- to decrease the number of cylinders, reformatting it and retesting
- the drive. The threshold of PAIN for the Drive on HP-UX was 2.15GB
- (Slightly less than 2.9).
-
- Im sure this will be a problem, even though the Hitachi DK-517
- is SCSI-2 compliant, on HP-UX until HP themselves make a 3.5GB disk drive
- and write support for a physical disk of that size into a later version
- of HP-UX. This error is the same, by the way, for the Seagate Elite 3
- 3.5GB disk drive.
-
- I had a posting to this newsgroup regarding the size of the
- math register in HP-UX earlier when I was diagnosing thsi problem.
- It took the use of a SCSI bus analyzer to figure out what was going on.
-
- In all fairness to Hitachi, you can guesstimate and contrive
- a disktab entry for the drive, run newfs sucessfully, write data to it
- and even run mkboot on it. The systems IPL wont recognize the bootfile
- on the drive if you reboot. The boot on that drive will fail. The systems
- diagnostics (XSTM, CSTM) will not recognize the drive either.
-
- As a data disk goes, it looks like it works. But the firmware and
- the disk is in an infantile stage as of today.
-
- The questions you must ask are: How often do I backup?
- How valueable is my data?
- And is it worth the cost of
- the DK-517C-37 drives to be
- a Beta site on a foreign shore?
-
-
- If you'd like proof, I've got what seems to be a couple miles of
- Z-fold printer paper with SCSI bus traces of the DK-517C-37 on the
- HP system. If you need reading material to put you to sleep.
-
- -Jeff Johnson
- Dir. of Engineering
- Western Scientific
- Systems and Peripherals
- jeff@wsm.com
-
-
-