Re: Tape vs HDD vs NAS (speed considerations and size etc)..


Steve Foster [SBS MVP] wrote:
markm75 wrote:

Yeah LTO-3 is what I was considering.. but the cost per tape, I believe
was kinda high, considering the number of them we'd need for a full
backup set (two of them to alternate offsite each week, etc).

I'm pretty sure our 350gb backup that we do runs about 10 hours or more
to SATAII's.. I forget, but I think the specs on some LTO's were only
around 20mB/s, so that would take 2x as long if so.

LTO3 from Quantum is rated at 68MB/s native.
LTO2 from Quantum is rated at 26MB/s native.

The best 3.5" 7200rpm drives are managing about 70MB/s write performance
(that's WD Raptors, Seagate Barracuda 7200.10)

--
Steve Foster [SBS MVP]
---------------------------------------
MVPs do not work for Microsoft. Please reply only to the newsgroups.

Thanks for the LTO3 specs...


(Anyone) Any experience using Quantum DLT-S4 drives? They come in at
around 111 MB/s native and hold 800gb native..

Seems like they may be the fastest "tape" approach...

Media runs about $82 bucs for one tape too (800/1600) ($52 for the
LTO3 400/800)

With the 800GB size drive.. I guess this would fit more nicely into a
weekly backup set to take off site.. assuming 1.2 TB of data.. I could
fairly easily figure out how many tapes that would be each week to
rotate..

I guess another approach (if faster).. would be a sata or scsi array
for the backups.. then backup the array to a tape library (assuming the
array would be faster than the tape). Of course the cost goes up a bit
more, but it provides more of a double assurance factor (even though,
technically we already have single drive internal backup units, but
these are beginning to run low on space at the end of 1 month, our full
backup cycle period).

.

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