eap@bu-pub.bu.edu (Eric A Pearce) (01/05/91)
Archive-name: hardware/scsi/sun-format/1991-01-04
Archive-directory: falstaff.mae.cwru.edu:/pub/format.dat/ [129.22.208.14]
Original-posting-by: eap@bu-pub.bu.edu (Eric A Pearce)
Original-subject: Need Help + format.dat entry for Fuji M2266SA
Reposted-by: emv@ox.com (Edward Vielmetti)
I got this entry from the archive on falstaff.cwru.edu.
The rest of the info came from Cranel Tech Support, Fujitsu Tech
Support and the Fujitsu BBS.
disk_type = "Fujitsu M2266SA" \
: ctlr = MD21 : fmt_time = 4 \
: cache = 0x11 : trks_zone = 15 : asect = 3 \
: ncyl = 1646 : acyl = 2 : pcyl = 1648 : nhead = 24 : nsect = 53 \
: rpm = 3600 : bpt = 31296
I'm really confused now that I talked with Fujitsu and Cranel
(the company we actually got them from)
Fujitsu says
ncyl = 1642 : acyl = 2 : pcyl = 1644 : nhead = 15 : nsect = 85
Cranel says
ncyl = 1656 : acyl = 2 : pcyl = 1658 : nhead = 15 : nsect = 82
I've formatted the drive under all 3 different settings and the first
entry yields the most disk space, 1072 meg. The other 2 give about
1042 meg.
The Fuji "Tech Tips" mention that the Sun device driver won't be able
to use the full capacity of the drive due to a limitation on the
size of the number used to store the number of blocks. Is there some way
to trick the drive using funny format.dat entries?
Does lying about the number of heads give you a desirable result?
What does the argument to the "cache" flag mean? Fujitsu and Cranel don't know.
These drives are going on SLCs, 4/370s, 4/470s, 4/280s and SS2s.
Do I need different jumper settings for SCSI-2 on these various platforms?
The situation I want to avoid is getting mail a month after I install
these saying I could have got an extra 100 meg and double the speed if
I had used a "magic" format entry and jumper settings.
These drives are selling like hotcakes, doesn't somebody have an entry they
are confident yields the most disk space and best performance?
(yes, I will summarize responses)
Thanks
-e
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Eric Pearce eap@bu-pub.bu.edu
Boston University Information Technology
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