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Re: Is my tape drive "shoe shinning" ?
2006-03-15 12:19:09
Guy Dallaire wrote:
According to my vendor, the LTO2 drive I'm about to buy is capable of
80Gb/Hour, that is approx 50 Mb/Sec if I'm right.
I wouldn't be too surprised if that very same controller negociated
80Mb/s with an LTO-2 drive.
But anyway, don't believe what they say. Vendors quote fantasy numbers
assuming that you use hardware compression, and that your data
compresses 2:1. An LTO-2 drive is capable of about 30Mb/s uncompressed,
and proportionally higher if you use hardware compression.
> I'm currently using an adaptec AHA2940U adapter with my DLT4000 drive.
> I think it's only capable of 20 Mb / Sec...
That means that if you don't use hardware compression, 20Mb/s is quite
acceptable for LTO-2. If on the contrary, you *do* use hardware
compression, you'd need to observe the average compressibility of your
data, and scale the figures appropriately. In that case, 20Mb/s might
be a bit slow.
Alex
--
Alexander Jolk / BUF Compagnie
tel +33-1 42 68 18 28 / fax +33-1 42 68 18 29
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