rz1db - rz2da disklabels

From: Burke, Stephen <Stephen.Burke_at_GTECH.COM>
Date: Wed, 29 Nov 2000 08:32:04 -0500

> -----Original Message-----
> From: Burke, Stephen
> Sent: Wednesday, November 29, 2000 2:30 PM
> To: 'alpha-osf-managers_at_ornl.gov'
> Subject: rz1db - rz2da disklabels
>
> Hi,
>
> Hopefully someone can explain why one is picked and not the other. I
> have a compaq workstation running DEC UNIX4.0d. I wanted to repartion one
> of my disks rz26 and I have come across something which I have no answer
> for. The name on the physical disk is RZ1DB in the cabinet and yet after I
> have cleared the old label and created a new one by doing
> disklabel -r -w rz26 RZ1DB it is picking up an RZ2DA disk label. The only
> difference between the two is the cylinder and track skew figures. My
> questions are 1> why does it pick up a different disk label and 2> how
> important are the cylinder and track skews in the label.
>
> Below are the original and the new label. I have since edited the new
> label so I could repartition to suit my needs for my database I wish to
> put there.
>
> If you can help with the questions I would be very happy indeed.
>
>
>
> Original
> # /dev/rrz26a:
> type: SCSI
> disk: RZ1DB-CS
> label:
> flags: dynamic_geometry
> bytes/sector: 512
> sectors/track: 168
> tracks/cylinder: 20
> sectors/cylinder: 3360
> cylinders: 5273
> sectors/unit: 17773524
> rpm: 7200
> interleave: 1
> trackskew: 20
> cylinderskew: 50
> headswitch: 0 # milliseconds
> track-to-track seek: 0 # milliseconds
> drivedata: 0
>
> 8 partitions:
> # size offset fstype [fsize bsize cpg]
> a: 1680 0 4.2BSD 1024 8192 16 # (Cyl. 0 - 0*)
> b: 6291456 1680 unused 0 0 # (Cyl. 0*-
> 1872*)
> c: 0 0 unused 0 0 # (Cyl. 0 - -1)
> d: 6291456 6293136 unused 0 0 # (Cyl. 1872*-
> 3745*)
> e: 1228800 12584592 unused 0 0 # (Cyl. 3745*-
> 4111*)
> f: 1024000 13813392 unused 0 0 # (Cyl. 4111*-
> 4415*)
> g: 1024000 14837392 unused 0 0 # (Cyl. 4415*-
> 4720*)
> h: 1912132 15861392 unused 0 0 # (Cyl. 4720*-
> 5289*)
>
>
> The new disklabel that I have amended to the way I want it to be for the
> databases etc.
> # /dev/rrz26a:
> type: SCSI
> disk: RZ2DA-LA
> label:
> flags: dynamic_geometry
> bytes/sector: 512
> sectors/track: 168
> tracks/cylinder: 20
> sectors/cylinder: 3360
> cylinders: 5273
> sectors/unit: 17773524
> rpm: 7200
> interleave: 1
> trackskew: 33
> cylinderskew: 6
> headswitch: 0 # milliseconds
> track-to-track seek: 0 # milliseconds
> drivedata: 0
>
> 8 partitions:
> # size offset fstype [fsize bsize cpg]
> a: 131072 0 unused 0 0 # (Cyl. 0 -
> 39*)
> b: 9216000 131072 unused 0 0 # (Cyl. 39*-
> 2781*)
> c: 17773524 0 unused 0 0 # (Cyl. 0 -
> 5289*)
> d: 2662400 9347072 unused 0 0 # (Cyl. 2781*-
> 3574*)
> e: 0 0 unused 0 0 # (Cyl. 0 - -1)
> f: 0 0 unused 0 0 # (Cyl. 0 - -1)
> g: 2048000 12009472 unused 0 0 # (Cyl. 3574*-
> 4183*)
> h: 819200 14057472 unused 0 0 # (Cyl. 4183*-
> 4427*)
>
>
> Thanks in advance,
>
>
> Stephen.
>
>
>
> Stephen Burke
> GTECH Sweden Corp.
> Software Dept.
> Office : 0046-8-56482809
> Mobile: 0046-709-822866
>
Received on Wed Nov 29 2000 - 13:33:33 NZDT