TurboSTORE Support for DLT
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Commercial Systems Division
About the DLT Drives
DLT drives offers the following advantages:
Faster Backups and more reliable backups
High capacity (up to 70 GB uncompressed)
Faster Restore and hence faster disaster recovery
TurboSTORE Products and the DLT
The following Turbostore products support DLT without the fast search option:
| Product Number | Product Description |
|---|---|
| 31900B | FOS Store |
| B5151AA | TurboStore/iX II |
| B5152AA | TurboSTORE/iX 7x24 True Online Backup |
About Fast Search on Tapes
The fast search concept is generally used when "restoring" files selectively from the tape. The MPE/iX environment variable HPFASTSEARCH should be set to TRUE for "fast search" to happen. Without fast search, files are skipped one at a time until the required file to be restored is reached. During fast search, a number equalled to the intervening tape marks or save set marks, between two consecutive files of the "restoreset", is calculated and skipped at one shot, to go to the next file to be restored. Fast search greatly improves the "restore" time.
Fast Search on DLT Tape Drives
MPE/iX 5.5 onwards the fast search on DLT is supported with the installation of the following patches:
MPEJXX0 for labelled DLT tapes. (STORE patch)
MPEJXT7 for unlabeled DLT tapes. (STORE patch)
MPEKX37 for support of DLT7000 tape drives. (IO patch)
MPE/iX Releases |
|||
|---|---|---|---|
| 5.5 | 6.0 |
6.5 |
|
| Patch required for labelled tapes | JXX0(D) | JXX0(C) | No patch required* |
| Patch required for unlabeled tapes | JXT7(B | No patch required | No patch required |
| Patch required for labelled tapes on DLT7000 | JXX0(D) & KX37(D | JXX0(C) & KX37(I) | No patch required |
| Patch required for unlabeled tapes on DLT7000 | JXT7(B) & KX37(D) | KX37(I) | No patch required |
| * No patch required means that, the patch has been rolled into the base OS. | |||
Limitation of JXX0
The MPE/iX command "FCOPY" cannot be used on the tape created using the store with this patch. To allow "fcopy", a new STORE option "FCOPY" is to be used while "storing". However this tape cannot support fast search while "restoring". So FCOPY and fast search are mutually exclusive.
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HP Secure Web Console |
DLT4000/DLT7000 Differential Tape Support on MPE/IX |