Re: Backup media

Before you selecting tape drive or library, you might want to determine how fast do you need to backup your database. DLT4000 will give you 2MB/sec and DLT7000 will give you 5MB/sec of transfer rate. Problem with DLT is that it is old technology like 4mm and 8mm. They are coming out with super DLT, which will give you 7MB/sec (i think) of transfer rate. But, super DLT and DLT is not compatible. Thus, you can not read tape that was written by super DLT in DLT drive. Also, you might want to look into AIT drive which give you 3MB/sec and storage of 35GB. But AIT 2 is coming or should be out already, which will give you 6MB/sec and storage of 50GB per tape. Also Sony makes DTF, which give you 12MB/sec with storage of 42GB per tape. DTF-2, which should be out this summary ( i think), should give you 24MB/sec and storage of 84GB. If you have data warehouse and don't want to spend too much money, you might want to look into AIT 2 drive. Hope this helps. Susik slee@gus.net At 1/13/99 11:25 AM , Art S. Kagel wrote: >Bill Weaver wrote: >> >> I'm looking into backup media for my Informix database as well as ontape vs >> onbar. We currently have 4mm Dat drives in our box which aren't sufficient. >> My hardware vendor wants to sell me DLT drives and was downplaying 8mm >> drives. Talking to another tape drive vendor and they were downplaying DLT >> drives and wanted to sell me 8mm drives. Both vendors sell both types but >> each has their preference and are telling me why I shouldn't use the other >> type of media. Now I'm confused. From your experience, is one really >> better than the other? Any recommendations? > >We use DLT7000 on Sun and a RAID array of 5 DLT4000 on DG systems and >have found them reliable. 4mm DAT is no good we used to use it and had >far too many bad tapes, if it were not for the DG RAID tape array's >ability to rebuild tape sets we would have had more than a few >disasters. I have never used 8mm DAT but have always heard that they >are also very reliable. I believe that DLT is faster though. > >Art S. Kagel ======================== Susik Lee slee@gus.net ========================

In article <77jjvp$qlo$1@news.xmission.com>, Susik Lee <slee@gus.net> writes > >Before you selecting tape drive or library, you might want to determine how >fast do you need to backup your database. DLT4000 will give you 2MB/sec ?? I have seen a DLT 4000 do 50Mb in 14 seconds which is more than 2Mb/sec!! >and DLT7000 will give you 5MB/sec of transfer rate. Problem with DLT is >that it is old technology like 4mm and 8mm. They are coming out with super >DLT, which will give you 7MB/sec (i think) of transfer rate. But, super >DLT and DLT is not compatible. Thus, you can not read tape that was >written by super DLT in DLT drive. Also, you might want to look into AIT >drive which give you 3MB/sec and storage of 35GB. But AIT 2 is coming or >should be out already, which will give you 6MB/sec and storage of 50GB per >tape. Also Sony makes DTF, which give you 12MB/sec with storage of 42GB >per tape. DTF-2, which should be out this summary ( i think), should give >you 24MB/sec and storage of 84GB. If you have data warehouse and don't >want to spend too much money, you might want to look into AIT 2 drive. > >Hope this helps. > >Susik >slee@gus.net > -- David Williams