Re: why is tapetype so slow?
2003-01-14 14:39:01
On Tue, Jan 14, 2003 at 01:33:03PM -0500, Eric Sproul wrote:
> Hi,
> I've been trying to run tapetype to get a reading on a new Compaq
> SDLT320 drive with 110/220 tapes. There are no tapetype definitions
> that I could find for this combination. I knew it would take a while
> (the last person to post an SDLT tapetype said it took him 2.5 days),
> but it took tapetype 3.5 days to write 112GB in the "short write" pass.
> Now it has started over with another pass and I fear I'm looking at
> another 3.5 days of waiting. Why is this?
Because something is wrong or you have a very old version of tapetype.
Your drive specs will include a speed rating, in MB/sec probably.
Divide that into your tape's rated capacity to get an approximation
of how long it will take to write a complete tape. Tapetype should
take about twice as long as it makes 2 passes.
Be sure in your calculation that you use matching speed and capacity
numbers. Matching in the sense of both refering to HW compression on
or both refering to HW compression off.
--
Jon H. LaBadie jon AT jgcomp DOT com
JG Computing
4455 Province Line Road (609) 252-0159
Princeton, NJ 08540-4322 (609) 683-7220 (fax)
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