[SunHELP] tape drive compression

[Edward Chase]

Yeah it makes sense, the tapes are advertised as 12Gb/24Gb.

The person I heard it from was using a DLT if that makes a difference...

Actually probably not, DLT tapes are sold as 20Gb/40Gb, etc.

But still, it may be old info.


At 04:45 PM 8/9/2002 +0100, Peter Stokes wrote:
>Hi Edward
>
>The DDS3 will either write in non or compressed mode, never heard of a third
>option. What you are possibly confusing it with are drives (not DAT) which
>can read/write 3 densities, much like the old 1/2" tape drives which
>supported 1600/3200/6250 bpi.
>
>If anyone would like to enlighten me further please do.
>
>Peter
>
>
>-----Original Message-----
>From: sunhelp-admin at sunhelp.org [mailto:sunhelp-admin at sunhelp.org]On
>Behalf Of Edward Chase
>Sent: 09 August 2002 15:30
>To: sunhelp at sunhelp.org
>Subject: [SunHELP] tape drive compression
>
>
>Hello, I've got a E3500 here with an internal DDS-3 tape drive in it.
>
>I've been doing backups using, ufsdump 0f /dev/rmt/0cn <filesystem name>
>
>I believe that writes to tape using "normal" compression.  I do believe
>that I've heard somewhere along the line that there is an "extra"
>compression mode.  Would this be /dev/rmt/0mn (max compression)?
>
>Right now I'm not worried about any extra time this may take, I don't wish
>to get into incremental or multi tape backups if I don't have to.
>
>TIA.