Re: [linux-lvm] Backup costs (was: LVM reimplementationre)

[Daniel Whicker <daniel.whicker@solidsystems.com>]

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Ben,
	I think you missed a very important aspect.  The actual investment of
the tape drives.  A SDLT or LTO drive is going to run from about $4000
on up.  According to datacomm warehouse, a HP 230 external LTO drives
runs $3700.  An SDLT drive runs $4300.  You can't compare just the media
costs with that of the drive.  Let's consider a 1TB of data.

SDLT:
$4300 + (10 tapes * $50) = $4800

LTO:
$3700 + (10 tapes * $130) = $5000

AIT2:
$2800 + (20 tapes * $90) = $4600

IDE:
10  Drives * 270 = $2700

DDS4:
$900 + (50 tapes * $24) = $2100

From these numbers (using DataComm Warehouse pricing), you can see that
to backup 1TB, the IDE drives are actually the second cheapest.  And
from a raw performance point of view, they far exceed all the other
alternatives from a random access standpoint, and they are comparable to
even LTO from a transfer rate point of view.

Sorry... had to address this point.

On Wed, 2002-02-06 at 13:14, Benjamin Scott wrote:
>   Here are some prices from a recent Datacomm Warehouse catalog:
> 
>   Item            GB   Cost  $/GB
>   --------------  ---  ----  ----
>   IDE HDD         100   270  2.70
>   AIT2             50    90  1.80
>   SuperDLT        110   150  1.36
>   LTO Ultrium     100   130  1.30
>   DDS-4            20    24  1.20
> 
>   As you can see, hard disk is actually the most expensive media, not the
> least.  This whole "hard disks are cheaper" thing is a myth propagated by
> people who have never actually looked at the numbers.


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