Quoting Jun Tanamal ([EMAIL PROTECTED]):
> My HPsurestore DAT24 is dead. Is DLT a better choice? Don't bother I
> won't do any data migration.
Some information on tape-drive technologies:
From [EMAIL PROTECTED] Wed Mar 20 11:33:47 2002
Date: Wed, 20 Mar 2002 11:32:49 -0800
To: [EMAIL PROTECTED]
Cc: Niall O Broin <[EMAIL PROTECTED]>
Subject: Re: [ILUG] backup options...
From: Rick Moen <[EMAIL PROTECTED]>
Quoting Niall O Broin ([EMAIL PROTECTED]):
> Ultrium (as previously mentioned) has 100GB native capacity, drive
> 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[1] 3 & 8MB[2] Exabyte
DLT3XL linear serpentine 15GB 1.5MB/s DEC, Quantum
DLT4 linear serpentine 20-40GB 3-5MB/s Quantum, others?
SDLT linear serpentine 110GB 6MB/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 3MB/s Various
DLT7000 linear serpentine 35GB 5MB/s Quantum
AIT helical scan 25-50GB 6MB/s[3] Sony
LTO linear serpentine 100GB 15MB/s IBM, Seagate
Also relevant: Cost of tapes, cost of drives, cost of replacement
heads, service life....
[1] When used in M2-type drives. M1 does 2.5-20GB.
[2] Thanks to Ray Kelly for furnishing AME speed figures.
[3] 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 PROTECTED] read something from _Structure and Interpretation of
Computer Programs_ to de-stress." -- The Cube, www.forum3000.org
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