WREN 8 format.dat Summary UPDATE & question.

From: nicky@davinci.concordia.ca
Date: Tue Jan 21 1992 - 13:30:54 CST


        Hello everyone,

        I have had somemore information provided me by Steve Campos.
        He says that on one Sun4/330 the format.dat entry for the
        wren 8 would cause a panic reboot during newfs.

>Here is the entry (along with some stats) :
>
>disk_type = "Highland SEAGATE Wren 8 ST41650N" \
> : ctlr = MD21 : fmt_time = 5 \
> : cache = 0x11 : trks_zone = 15 : asect = 5 : atrks = 30 \
> : ncyl = 1770 : acyl = 2 : pcyl = 1772 : nhead = 15 : nsect = 104 \
> : rpm = 3600 : bpt = 54900

        He has supplied me with a new one that according to him
        will work on all Sun4 systems. The one shown previously
        worked for me until I tried a restore on a particular partition.
        panic reboot with lots of fatal write errors before. Here is the
        entry ( as yet untested by me - RSN ).

disk_type = "Highland SEAGATE Wren 8 a ST41650N" \
   : ctlr = MD21 : fmt_time = 5 \
   : cache = 0x11 : trks_zone = 15 : asect = 5 : atrks = 30 \
   : ncyl = 2116 : acyl = 2 : pcyl = 2118 : nhead = 15 : nsect = 87 \
   : rpm = 3600 : bpt = 54900

        While I have your attention...

        This is more of an inquiry than an emergency. I would like some
        information on the ramifications of using the "-m free-space%"
        option to newfs. When using 1.2G disks now days, 10% comes out
        to an awfully large number. Is there any thing that one should
        take note of when using 1 or 2 per-cent? How does it affect
        performance? Is it best to leave well enough alone?

        Are there any good tutorials in netland about tunefs, mkfs, etc...?

        I gather that most of the answers will be subjective, but I
        will do my best to provide a worthwhile summary, but it may
        take a while.

Thanks for your time.

Nicky.

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 Nick Ayoub nicky@davinci.concordia.ca UNIX Systems Analyst
 Dept. of E&CE Concordia University CAD Systems Support
 Montreal QC. H3G 1M8 Voice : (514) 848-3107
 Canada Fax : (514) 848-2802
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