On May 3, 2013, at 12:03 PM, lst_ho...@kwsoft.de wrote: > > Zitat von Francisco Garcia Perez <fga...@gmail.com>: > >> Hello, >> I have a PowerVault 124T, but I want buy a new backup system with support >> for my old LTO-2 and LTO-3 tapes with at least 24 slots, 2 drives, a >> barcode scanner. What do you recommend me? >> > > If you really need support for reading your old LTO-2 tapes you are > limited to LTO-4 because the read compatibility is maintained two > steps down as far as i know. Instead of this you should rather use at > least LTO-5 today and copy your data still needed from the old LTO > tapes. As of brands recommended for tape libraries: Most of the > mid-sized libraries (HP, IBM, Dell) are rebranded BDTs which work well > with Bacula. For the tape drives some say that full-height are more > solid than the half-height, but i don't have first hand experience for > this.
Regarding the full-height vs. half-height issue, IMHO, it does benefit you to read the small print. In my case, we bought a Quantum SuperLoader3 LTO-4HH SAS, 16 Slots/2 Magazine 2U rack mount unit. I assumed at the time the HH (half-height) only affected the physical form factor and nothing else. Turns out I was wrong. Puzzled by the "slower" speeds I got with btape (65 to 78 MB/s), I took a hard look at the data sheet for the SuperLoader3 family[1] and the explanation leapt out at me. The quoted performance differs between the LTO-4HH and LTO-4 drives: 288 GB/hour vs 432 GB/hour (native speeds). The former equates to about 82 MB/s whereas the latter parallels the LTO-4 spec max native speed of 120 MB/s. So, there was a definite difference between going half-height and full-height there. Unfortunately, for their LTO-4 SAS offerings, only (slower) half-height was available. Fortunately, for LTO-5 and above, there was no documented speed penalty for going half-height vs. full-height, so maybe Quantum have got their engineering sorted out re: what was affecting their LTO-4 drives? In all other respects, though, I have been very happy with the Quantum SuperLoader3 LTO-4HH SAS unit. (I realise this doesn't meet the OP's specifications, though.) Cheers, Paul. [1] https://iq.quantum.com/exLink.asp?8357556OK69N63I33059211 ------------------------------------------------------------------------------ Get 100% visibility into Java/.NET code with AppDynamics Lite It's a free troubleshooting tool designed for production Get down to code-level detail for bottlenecks, with <2% overhead. Download for free and get started troubleshooting in minutes. http://p.sf.net/sfu/appdyn_d2d_ap2 _______________________________________________ Bacula-users mailing list Bacula-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/bacula-users
