Subject: RE: Simple Question: dump params. for TK50?
To: 'Jonathan Sturges' <jonathan@cc.odu.edu>
From: Gunnar Helliesen <gunnar@bitcon.no>
List: port-vax
Date: 02/12/1997 22:31:33
I hope DEC forgives me for posting this, but here goes:
>From the 'dump' man page on Digital Unix 3.2c:
-b blocks_per_write
Specifies the number of blocks in 1024 bytes to write to the
storage medium. The default write block value is 10 blocks
(or
10 kilobytes). In many instances, increasing the number of
blocks per write will increase your dump performance. For
optimal results on Digital's platform, use a value that is
greater than or equal to 32, is a multiple of 4, and is less
than
65.
[snip...]
___________________________________________________
Tape Device Density Size Size
(bpi) (feet) (1024-byte blocks)
___________________________________________________
TA78 6250 1925 141056
TA79 6250 1925 141056
TA81 6250 1925 141056
TA90 38000 436 194560
TA91 38000 436 194560
TF30 6667 1182 92416
TF70 10000 2457 287948
TF70L 10000 2457 287948
TK50 6667 1182 92416
TK70 10000 2457 287948
TKZ09 54000 7456 4718592
TLZ04 61000 1584 1132646
TLZ06 61000 2640 1887436
TS05 1600 2075 38912
TU77 1600 2075 38912
TU78 1600 2075 38912
TU80 1600 2075 38912
TU81 1600 2075 38912
TU81E 1600 2075 38912
TZ05 1600 2075 38912
TZ07 1600 2075 38912
TZ30 6667 1182 92416
TZ85 42500 4925 2453299
TZ857 42500 4925 2453299
TZK08 54000 3276 2073600
TZK10 16000 2580 483840
___________________________________________________
Gunnar
--
Gunnar Helliesen | Bergen IT Consult AS | NetBSD/VAX on a uVAX II
Systems Consultant | Bergen, Norway | '86 Jaguar Sovereign 4.2
gunnar@bitcon.no | http://www.bitcon.no/ | '73 Mercedes 280 (240D)
>-----Original Message-----
>From: Jonathan Sturges [SMTP:jonathan@cc.odu.edu]
>Sent: Wednesday, February 12, 1997 10:06 PM
>To: port-vax@NetBSD.ORG
>Subject: Simple Question: dump params. for TK50?
>
>This may be not exactly NetBSD... but here goes.
>
>What are the _proper_ parameters for 'dump' for a TK50? I'm referring to
>the 'bds' flags: blocking factor, density, size.
>
>I just realized I think I've been doing backups with the 'dump' defaults,
>which I think are pretty horrible (at least, they are in other BSD systems).
>I'd like to pack those tapes if I could... I know they're supposed to
>hold 91Mb or so...
>
>thanks,
>Jonathan
>