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Knowledgebase : Using tape drives
During the autodetection of drives and changers, it sometimes happens that the drives are mapped in a wrong order, especially when configuring Fiber-Channel devices. The media changer accesses drives by their physical position, whereas PresSTORE "sees"...
Q: How does data compression work? I see a setting under Drive configuration -> Additional Options. A: Presstore uses hardware compression - in case of a physical drive. Otherwise, the zip compression techniques are used for the disk storage. The ha...
QUESTION: If I change the retention period on a full backup will it update the volumes accordingly ? ANSWER: The expiration date of a tape volume is changed only when a run of a backup plan uses this tape. Furthermore, it will not be reset to ...
When getting the message OPEN SD: NO SUCH DEVICE OR ADDRESS (POSIX ENXIO {NO SUCH DEVICE OR ADDRESS}) on attempting to access the tape drive or media changer, this means that the host has lost the connection to the external device. Try reboo...
Tape drives require cleaning from time to time. Here is how to determine when this should be done: Usually the tape drive itself determines if cleaning is required and passes this through the SCSI interface. PresSTORE contains a mechanism that allows to...
Verify is somewhat superfluous, since the tape drive technology itself does an automatic verify after write, and PresSTORE's job aborts if the drive delivers an an error. Although unnecessary, we have added the verify function for the user's peace of mind...
LTO tape drives can read/write media of the same generation , as well as of the prior generation. LTO drives can read only tapes two generations back. For example, a LTO-6 tape drive can read & write LTO-6 & LTO-5 media. It can read only LTO-4 media - but...
The Wikipedia article http://en.wikipedia.org/wiki/Linear_Tape-Open [1] lists some interesting technical data about LTO tapes that we would like to comment on: TAPE DURABILITY An LTO tape is good for * 15 to 30 years archival (this number is ...
When migrating to another tape generation, it may be neccessary to migrate archived data to a different pool as well. * PresSTORE offers an option to migrate a set of archive volumes to another volume pool. To do so: * Create an Archive Pool on the ...
QUESTION(S): "I am interested in your PresSTORE archive system, however, i'd like to know what is the archival format. Is it an open format such as TAR? Or is it a proprietary format?" & "We are planning on implementing a very long term archiv...
In order to set up the drive cleaning, select the jukebox manager and double click the jukebox. On the General Setup page there is a section Drive Cleaning. Enter the slot number where the cleaning tape is placed, how many cleaning cycles are allowed f...
As of 3.2.2, PresSTORE includes a simple tape drive speed test utility. This utility can be used to check the data transfer to and from a single tape drive. In order to perform the test, please label a tape (preferably a new tape) in PresSTORE's Storage...
Q: How is the expiration date for volumes calculated? A: The expiration date of a volume is set when the volume is involved by a backup plan. It is calculated based on the number of cycles chosen and the schedule of full backups defined in the plan. E.g....
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