I'm currently having problems restoring files from my amanda backup system. I am able to narrow the problem down to my AIT-2 tape drive. If I restore files from amanda backups that are still on the holding disk, I have a successful restore. If I restore files from any of the AIT-2 tapes, I get tar errors.
What kind of tar errors?
So I have a few questions:
1) When amanda uses tar to backup the data, what is the blocking size that amanda uses?
Default blocksize is 32Kbytes, but can be configured when compiling amanda, and on the settings of the hardware.
2) If anyone here is using an sdx-500 AIT-2 tape drive, what are your dip switches set to? (I'm wondering if I need to enable variable block sizing on the drive).
Variable blocksize is necessary to get the 32K blocks that amanda tries to use. If you have a fixed blocked size of e.g. 512 bytes, then no matter the blocksize amanda writes, it will be chunked up in 512 bytes on tape (and that very very slow).
3) Has anyone else using an AIT tape drive had similar problems?
I am a satisfied user of AIT-1 for more than 3 years now. I had no problems, nor did I need to change the dipswitches from the factory defaults.
A lot of settings depend on the OS where the tapedrive is connected to. And of course the quality of the scsi-link (good cables? good terminated?....)
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