To 2:
We have IBM-7331-205 (1 Drive, AIX325). ADSM can't regognize it, we
musst manualy instal
it (ADSM has a lack at this point).
There is a problem betwen ADSM's mtx and AIX's rmtx drivers, if you want
to use the drive
with other software that change the settings of the tape. In that case
you musst manualy
disable the mtx device, so other software (mksysb for example) can work.
This can be a
problem if ADSM's disseaster recovery will be based on mksysb.
But this is a general problem that ADSM uses the own device-drivers
and not
the drivers of the OS.
We have no more problems with the drive as with other tapes
-the mounts are a bit too slow.
To 3:
To 3:
Theoreticaly the medium stress is: on a linear tape < 4mm tape < 8mm
tape,
but a good 8mm tecnology cann be more secure than a bad linear-tecnology
implementation
and -for example- a slow 8mm tape is more secure than a fast 8mm tape.
To 4:
2 drives is better than 1, a) the speed,
b) wenn you will to move data from the
medium
bad medium, colocation, ...
This will be significant if you can,t have disk space to store the
data.
- a compressed 8505XL tape can have 14 GB, a 4700T 40 GB
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
>
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