From email@example.com Wed Mar 20
Date: Wed, 20 Mar 2002 11:32:49 -0800
Cc: Niall O Broin firstname.lastname@example.org
Subject: Re: [ILUG] backup options...
From: Rick Moen email@example.com
Quoting Niall O Broin (firstname.lastname@example.org):
> Ultrium (as previously mentioned) has 100GB native
> costs $3000 (best price on pricewatch, so you'll probably pay somewhat
> more) and cartridges are $85 + - claims to backup 108GB per hour which
> is of course with mythical compression of 2:1 so actually claim is
> 54GB / hour which is 15 Mbyte/second which is pretty nippy :-) I read
> on review of this which said that the speed claim is not marketing
> bullshit and that it is actually very fast.
LTO ("Ultrium") is pretty damned good. For those who can afford the price of admission. <sigh> In its class, you have SDLT and damned little else.
One point of comparison is of course helical scan vs linear vs. other. As noted previously, helical scan wears tapes and heads rapidly.
Media type Head type Nom. capacity Nom. speed Vendors 8mm helical scan 2GB/5GB 500kB/s Exabyte, Tandberg "AME" 8mm helical scan 20-60GB 3 & 8MB Exabyte DLTtapeIII linear serpentine 10GB DLTtapeIV linear serpentine 20-40GB 3-5MB/s Quantum, others? DLT1 linear serpentine 40GB 3MB/s DLT3XL linear serpentine 15GB 1.5MB/s DEC, Quantum DLT7000 linear serpentine 35GB 5MB/s Quantum DLT8000 linear serpentine 40GB 6MB/s Quantum DLTtape VS1 linear serpentine 80GB SuperDLT linear serpentine 110GB 11MB/s Quantum, Tandberg DDS2 helical scan 2GB/4GB 500kB/s HP and others DDS3 helical scan 12GB 1.5MB/s HP and others DDS4 helical scan 20GB 2.4MB/s Various VXA-1 linear serpentine? 33GB 3MB/s Ecrix AIT helical scan 25-50GB 6MB/s Sony AIT-2 helical scan 50GB 6MB/s Sony LTO linear serpentine 100GB 16MB/s IBM, Seagate, HP ADR2 linear serpentine 120GB 5MB/s OnStream
Also relevant: Cost of tapes, cost of drives, cost of replacement heads, service life....
Be sure to consult The Linux Tape Device Certification Program, before buying any drive: http://www.linuxtapecert.org/
 When used in M2-type drives. M1 does 2.5-20GB.
 Thanks to Ray Kelly for furnishing AME speed figures.
 That's with AIT2 drives. AIT3 drives do 12MB/s, with 100GB capacity.
Cheers, "Learning Java has been a slow and tortuous process for me. Every Rick Moen few minutes, I start screaming 'No, you fools!' and have to go email@example.com read something from _Structure and Interpretation of Computer Programs_ to de-stress." -- The Cube, www.forum3000.org