Zvi Bar-Deroma wrote:
>
> Hi,
>
> I have to make a quick decision concerning the purchase of an autochanger
> of some-magnetic tapes for use with ADSM. The server is an AIX machine
> (RS/6k - 560). The data to be backed up is a lot smaller than some/many
> discussed in this list - no penta/tera bytes....I guess that for the first
> year it'll be 20-30 GB, doubling at the second year. No databases involved,
> "just" general purpose use at an Engineering department in a university.
>
> My options are:
>
> 1. Exabyte EXT 210 T/2 (10 cartridges, 2 drives, 70GB uncompressed)
> 2. Exabyte EXT 210 T/2-8900S (10 cart., 2 drives, 200GB uncompressed)
> 3. IBM 7331-205 (20 carts., 2 drives, 140GB uncompressed)
> 4. IBM 3570-B01 (20 carts., 1 drive, 100GB uncompressed)
> 5. Quantum DLT 2700T (7 carts., 1 drive, 105GB uncompressed)
> 6. Quantum DLT 4700T (7 carts., 1 drive, 140GB uncompressed)
>
> Questions:
>
> 1. To ADSM development - #4 (3570, the Magstar MP) is not on your h/w
> list (on the WEB); as for the Quantum drives (#5,6), other models are
> mentioned there (2000T, 2000XT, 4000). What are the plans for availability
> of support for these Changers (mainly for #4 ) for AIX servers ? Please
> specify dates (even if estimated/approximate).
>
> 2. Are there any user experiences with these drives (good or bad) in
> conjuction with ADSM usage, as well as any other issues.
>
> 3. Can anyone shed light on the reliability of the 3 1/2 technologies
> of the above drives (8mm. + 8mm. Mamoth, DLT and Magstar) ?
>
> 4. What (if at all) is the merit of 2 vs. 1 drive ? Can ADSM exploit
> this feature where available (I guess the 2 issues can be involved -
> speed and reliability) ?
>
> 5. Anyone willing to briefly explain (or refer me to some url) about
> the differences between the "hellical scan tape" vs. Linear tapes ?
>
> Your fast response would be greatly appreciated.
>
> Regards,
>
> /Zvika
>
> Zvika Bar-Deroma
> Systems and Network manager Phone: (+972)-4-829-2706
> Faculty of Aerospace Engineering, Fax : (+972)-4-823-1848
> Technion Home phone:
> Haifa 32000 (+972)-4-823-5562
> Israel
>
> Internet : zvika AT aeserv.technion.ac DOT il
>
> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
I have the IBM 7331-205 and I agree with Yves Tremblay. It is a very
reliable unit. It's only drawback mechanically is that the user has
to manually do the cleaning even though the 7331 has a 'cleaning'
feature, ADSM does not allow cleaning tapes to be stored in the bonus
slot. The audit library command will not come to successfull completion
if it finds a cleaning tape since it does mount all the drives to
verify their label.
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