BIG THANKS for the time-saving information!!!
Jun
Rick Moen wrote:
> 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.
>
>
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