Original post:
> I have a 1.3G Fujitsu M2266SA SCSI disk and do not think that the format.dat
> entry I have is correct. I believe that I am losing too much in overhead.
> The entry I have is the following:
>
> disk_type = "Fujitsu M2266SA" \
> : ctlr = MD21 : fmt_time = 2 \
> : ncyl = 1642 : acyl = 2 : pcyl = 1644 : nhead = 15 : nsect = 85 \
> : rpm = 3600 : bpt = 46635
>
> partition = "Fujitsu M2266SA" \
> : disk = "Fujitsu M2266SA" : ctlr = MD21 \
> : a = 0, 31875 : b = 25, 38250 : c = 0, 2093550 : g = 55, 2023425
>
> I made one partition on sd0a using the same number listed in c above (i.e.
> 2093550). This give me a df listing of kbytes available as 983309. These
> numbers say that I am losing about 24% of the disk in overhead which is
> too much because I am getting an overhead count of about 13% with each of
> the other disks on the system (which is a 4/280). I believe that the
> format.dat numbers are wrong. This does not surprise me because we bought a
> Seagate WREN IX from the same VAR and got the wrong format.dat entry for
> this also (thanks to someone here, I got the right numbers). Ok, enough
> verbage...
> Question:
> 1. Is the entry in format.dat correct?
> 2. Is the Fujitsu M2266SA a 1.3G disk?
> 3. Side note: Is the Seagate WREN IX a 2.0G disk?
>
> Can anyone help?
>
> Thanks in advance,
> Dan...
>
> --
> Dan Kelley () ===== ===== = = = //// = =
> () = === = = ////// == =
> dkell@telxon.com () = ===== ===== = ////// = == Corp.
> (216)-867-3700 x3512 () //// Akron, OH
Well, well. There were about as many differences as there were responses.
1. Suggestions for format.dat entry:
=> From Mike Raffety:
disk_type = "Fujitsu M2266SA-512" \
: ctlr = MD21 : fmt_time = 4 \
: trks_zone = 15 : asect = 3 \
: pcyl = 1658 : ncyl = 1652 : acyl = 2 \
: nhead = 15 : nsect = 85 \
: rpm = 3600 : bpt = 50910
=> From Luis Vallejo:
The disk drive physical characterintis are :
Cylinders Heads Sectors Capacity
===========================================
1658 15 85 1079.1 MB
Sun recomends to reserve 6 cylinders and 2 alternated so you may want
to try this:
Cyl Alt/Cyl Heads Sect/Track
=======================================
1648 2 15 85
This will increase the size of the drive.
The difference is from 2093550 to 2101200 wich is about 35 Mb
=> From nancy@aspiring.unh.edu:
ncyl=1648
c = 0, 2101200
=> From Rafi Sadowsky:
ncyl=1656:pcyl=165
=> From lees@cps.msu.edu:`
disk_type = "FUJITSU-M2266SA" \
: ctlr = MD21 \
: trks_zone = 15 : asect = 3 : atrks = 30 \
: ncyl = 1703 : acyl = 2 : pcyl = 1705 : nhead = 15 \
: nsect = 82 : rpm = 3600 : bpt = 50910
#
partition = "FUJITSU-M2266SA" \
: disk = "FUJITSU-M2266SA" : ctlr = MD21 \
: c = 0, 2094690
This is what "df" shows for four of them on this system:
/dev/sd1c 983983 685041 200544 77% /home/pixel/u41
/dev/sd4c 983983 752528 133057 85% /home/pixel/u42
/dev/sd5c 983983 768351 117234 87% /home/pixel/u43
/dev/sd6c 983983 697762 187823 79% /home/pixel/u44
=> From Marc Phillips:
disk_type = "Fujitsu M2266S" \
: ctlr = SCSI : fmt_time = 4 \
: cache = 0x11 \
: ncyl = 1642 : acyl = 2 : pcyl = 1644 : nhead = 15 \
: nsect = 85 : rpm = 3600 : bpt = 43520
partition = "Fujitsu M2266S" \
: disk = "Fujitsu M2266S" : ctlr = SCSI \
: c = 0, 2093550
=> From Jim Davis:
I have a number of these disks; I used 1705 for the number of physical
cylinders, with 2 alternates; 15 heads, and 82 for nsect. But
overall it doesn't seem to make much difference, because I get 983983
kbytes for the disk. The "Technical Handbook" for these drives lists
this drive as 1079.1 MB (with 512 byte blocks), so 1.3 Gig is probably
a bit high and the 983309 KB after formatting and building the
filesystems sounds about right.
2. Size of Fujitsu:
2 replys agreed that it is 1.3G unformatted
4 replys said that the size is 1.2G unformatted
4 replys said that the size is 1.079G unformatted (1 added that
it formats to 1.05G)
3. Size of Seagate WREN IX:
Nobody knows. I guess the disk is too new.
I don't know if I am any better off :-) but thanks to the following for
their input:
Rafi Sadowsky <rafi@tavor.openu.ac.il>
fergus@lincoln.gpsemi.com
bit!jayl@ogicse (Jay Lessert)
trdlnk!mike@uunet.UU.NET (Michael Sullivan)
lees@cps.msu.edu
poffen@sj.ate.slb.com (Russ Poffenberger)
phillips@athena.Qualcomm.COM (Marc Phillips)
Christopher Davis <ckd@eff.org>
jdavis@noao.edu (Jim Davis)
Larry Chin <larry@cch.com>
nancy@aspiring.unh.edu
polaris1!support!lv@uunet.UU.NET (Luis Vallejo)
Mike Raffety <miker@sbcoc.com>
Dan...
--
Dan Kelley () ===== ===== = = = //// = =
() = === = = ////// == =
dkell@telxon.com () = ===== ===== = ////// = == Corp.
(216)-867-3700 x3512 () //// Akron, OH
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