On Tuesday 13 August 2002 08:20, Kevin Passey wrote:
>Hi again,
>
>Christoph was correct - I dug the manual out and the drive is
> installed by default with hardware compression on.
>
>You have to set the first dip switch to off - I'm tapetype - ing
> as I type.
>
>I will post the results here - if anyone is interested.
>
>Kevin
>
>-----Original Message-----
From: Christoph Scheeder [mailto:christoph.scheeder AT scheeder DOT de]
>Sent: 13 August 2002 10:33
>To: Kevin Passey
>Cc: Amanda (E-mail)
>Subject: Re: tapetype for dell powervault 100T DDS4 drive - using
> 150m Fuji ta pe
>
>
>Hi,
>your assumptions below are correct,
>but the size of your tapetype is a little of of what it should
> be... a DDS-4 drive with 150m tapes is supposed to hold about
> 20GB of data. the values tapetype reports makes me beleave your
> tapedrive is using hardware-compression.
>This is bad/a no-no for tapetype.
>Tapetype writes random data to the tape to mesure the raw
> capacity. if you try to compress that data, it will become
> bigger, and tapetype will hit eot much earlier then without
> compression. By the way, amanda likes to have control over
> compression, so it's a good idea to switch hardwarecompression
> completly of for drives used by amanda.
>Christoph
>
>Kevin Passey wrote:
>> Hi,
>>
>> I have just run tapetype for the above drive - it looks like
>> this.
>>
>> ./tapetype -f /dev/nst0
>> wrote 530067 32kb blocks in 1621 files in 7441 seconds (short
>> write) wrote 530076 32kb blocks in 3252 files in 7408 seconds
>> (short write)
>>
>> define tapetype unknown-tapetype {
>> comment "just produced by tapetype program"
>> length 16564 mbytes
>> filemark 0 kbytes
>> speed 2284 kps
>> }
>>
>> I have used a 150m DG4-150 Fujifilm 4mm tape.
>>
>> I presume I just include this code in the amanda.conf file.
>>
>> One question I need help on - does it matter that the tapetype
>> is un-known
>
>-
>
>> or can I just include it like this:-
>>
>> define tapetype PV100T-DDS4 {
>> comment "PowerVault 100T DDS4"
>> length 16564 mbytes
>> filemark 0 kbytes
>> speed 2284 kps
>> }
>>
>> Thanks in advance
>>
>> Kevin Passey
I'd wondered about that myself as I would have expected maybe 19.xx
gigs if it was off, but only 12 or 13 if it was on.
--
Cheers, Gene
AMD K6-III@500mhz 320M
Athlon1600XP@1400mhz 512M
99.11% setiathome rank, not too shabby for a WV hillbilly
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