From owner-freebsd-scsi Tue Jun 16 03:14:10 1998 Return-Path: Received: (from majordom@localhost) by hub.freebsd.org (8.8.8/8.8.8) id DAA09933 for freebsd-scsi-outgoing; Tue, 16 Jun 1998 03:14:10 -0700 (PDT) (envelope-from owner-freebsd-scsi@FreeBSD.ORG) Received: from nanguo.chalmers.com.au (gateway.chalmers.com.au [203.1.96.1]) by hub.freebsd.org (8.8.8/8.8.8) with ESMTP id DAA09868 for ; Tue, 16 Jun 1998 03:13:54 -0700 (PDT) (envelope-from robert@chalmers.com.au) Received: from chalmers.com.au (carbon.chalmers.com.au [203.1.96.26]) by nanguo.chalmers.com.au (8.8.8/8.8.8) with ESMTP id UAA18966; Tue, 16 Jun 1998 20:10:49 +1000 (EST) Message-ID: <35864725.37A32CCC@chalmers.com.au> Date: Tue, 16 Jun 1998 20:21:25 +1000 From: Robert Chalmers Reply-To: robert@chalmers.com.au Organization: chalmers.com.au X-Mailer: Mozilla 4.04 [en] (Win95; I) MIME-Version: 1.0 To: ts@polynet.lviv.ua CC: freebsd-scsi@FreeBSD.ORG Subject: Re: Fujitsu SCSI MO 640M - disklabel and newfs problem References: Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Sender: owner-freebsd-scsi@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.org Hi there, This may be of help. I just went through this myself recently. Note please that the disk I used was a different one to yours, but the principleis the same. ======== start here ========= This is the process I used to set up a dedicated, non-boot second SCSI disk. I used an Adaptec 1542 controller. I received some good advice from Malte Lance regarding the formula to use initially to calculate disk size in sectors. I also discovered that someone else had mentioned that having an #nt value greater than 64 on i386 systems could cause incorrect results. This may be so, however Malte's formula works, and actually returns the correct number of sectors. Even though the final process chenges them to the correct ones. Malte swears by fdisk, but I prefer not to use it for various reasons. The business of setting up a SCSI drive this way can seem complex, but if taken a step at a time goes ok usually. If you have a new SCSI drive, there is no need to format it. However, there is some inforamtion you need to discover, the most important of which is the total number of cylinders on the disk. Scsiformat is the only way I know of discovering this. You should note here that this first comamnd is non-destructive. On a new drive it should be all you need. Use the scsiformat command to discover your number of cylinders. This has a -p, and an ordinary 'd' followed bye the drive id. sd1 for your second disk. Don't mess with the primary disk, which would be sd0. All the man commands use sd0 as examples, so don't type them by mistake. You will nuke your operating system! So, Command line: scsiformat -p d sd1 Returns; (in my case) ---------------- COMPAQ C2490A 3184 Mode data length: 35 Medium type: 0 Device Specific Parameter: 0 Block descriptor length: 8 Density code: 0 Number of blocks: 0 Reserved: 0 Block length: 512 PS: 0 Reserved: 0 Page code: 4 Page length: 22 Number of Cylinders: 2630 <------------ this is what you want. Number of Heads: 18 Starting Cylinder-Write Precompensation: 0 Starting Cylinder-Reduced Write Current: 0 Drive Step Rate: 0 Landing Zone Cylinder: 0 Reserved: 0 RPL: 0 Rotational Offset: 0 Reserved: 0 Medium Rotation Rate: 6400 Reserved: 0 Reserved: 0 -------------------------------- You should redirect this output to the printer. Keep it for future reference. If you have a second hand disk, or the above command would not return the correct information, or any information, you may have to actually do a low-level format of the drive. This wont hurt, but can take ...... ages ...... When it starts, you get a warning that formatting will take place in three (3) seconds ahhhhhh. Dont worry, unless you used the wrong disk id. Make sure you get sd1 right, not sd0!!!! Commandline: scsiformat -w sd1 Starts in 3 seconds.... (takes about 15 minutes for a 2.1Gb drive) Write down your total number of cylinders number, or re-issue the scsiformat -p -d sd1 command and print it out. -------------------------------- Next step is to set up your disktab entry. Set up /etc/disktab entry: entry for a 2.1Gb Compaq SCSI Calculate true size in sectors with this formula; sectors/track * tracks/cylinder * cylinders Malte suggests #ns=32 #nt=64 and your total cylinder number gleaned from the scsiformat -p d sd1 command. In my case, the formula gives: 32 * 64 * 2630 = 5386240 -------------------------------- My disktab entry looks like this; c2490a|Compaq C2490A SCSI:\ :ty=winchester:dt=SCSI:ns#32:nt#64:nc#2630:\ :pa#2055000:oa#0:ta=4.2BSD:\ :pb#336640:ob#2055000:tb=swap:\ :pc#5386240:oc#0:\ :pd#1497300:od#2391640:td=4.2BSD:\ :pe#1497300:oe#3888940:te=4.2BSD: This actually states the partiton sizes, and the offsets. That is, where each partiton starts. Look at the last entry. It starts at sector 3888940, and is 1497300 in size. adds up to 5386240, the total size. You cant go past that of course. ------------------------------ Having checked your work, run this little script: it prevents you typing in the wrong scsi disk number!!! I called it tabmake.sh, and set it 755. disklabel -w -r /dev/rsd1c c2490a sd1s1 echo "Done" This SHOULD run with out error and produce the word "Done" If you get errors - go back and check your numbers in disktab! Then, disklabel sd1 should produce your equivelant of this. I notice also that the RPM is different to thatin the scsiformat command line return. Which gives 6400 Also, once you have used disktab, your cant do it this way again, unless you go back to step 1, and format the drive to remove the partition information. Ok, to check you work, do a disklabel sd1 You will notice that the numbers have changed from those in the disktab entry. Don't worry. Its a 'best fit' effort by the system to round things off on boundaries. You can actually modify this with the disklabel editing facility, and write it back to disk. Be careful though. # /dev/rsd1c: type: SCSI disk: c2490a label: sd1s1 flags: bytes/sector: 512 sectors/track: 32 tracks/cylinder: 64 sectors/cylinder: 2048 cylinders: 2006 sectors/unit: 4110000 rpm: 3600 interleave: 1 trackskew: 0 cylinderskew: 0 headswitch: 0 # milliseconds track-to-track seek: 0 # milliseconds drivedata: 0 5 partitions: # size offset fstype [fsize bsize bps/cpg] a: 2055000 0 4.2BSD 0 0 0 # (Cyl. 0 - 1003*) b: 336640 2055000 swap # (Cyl. 1003*- 1167*) c: 4110000 0 unused 0 0 # (Cyl. 0 - 2006*) d: 1497300 2391640 4.2BSD 0 0 0 # (Cyl. 1167*- 1898*) e: 1497300 2612700 4.2BSD 0 0 0 # (Cyl. 1275*- 2006*) Ok, thats about it. Its an interesting experiment. You get to see whats going on, and learn how to write a disktab entry into the bargin. Bob =========== end here ============= ts@polynet.lviv.ua wrote: > > Hi > I have Fujitsu SCSI-2 MO 640M drive and a disk for it. > The OS sees the drive but I have a problem using a disk (was OK with Win). > Can anyone tell me what parameters I can use to disklabel it? > Strange, is this device/disk unpopular to freebsd people, cos I can not > find it in disktab? > Thanks. > > To Unsubscribe: send mail to majordomo@FreeBSD.org > with "unsubscribe freebsd-scsi" in the body of the message -- Support Whirled Peas. Business in China? China House robert@chalmers.com.au ph:61 7 49440357 fx:61 7 49578425 China House Uses Webposition to ensure Top Spot in Searches http://www.chalmers.com.au/ChinaHouse/Business/webposition To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-scsi" in the body of the message