On Tue, Jul 05, 2005 at 02:02:02PM +0700, nghiatd wrote: > a.. 9 tapes have 'Access=Read-Only', 'Number of Write Errors: 1' > b.. 1 tape has 'Access=Unavailable', 'Number of Write Errors: 1
Perhaps that batch of LTO2 tapes was bad, but it's more likely that one of your drives has problems. Check your logs to see in which drive all these errors occurred. > In addition, Capacity of tape aslo display lot of different value (629,557.2 > MB; 372,665.2 MB; 481,247.3 MB) although capacity of tapes is 200/400 GB. This is normal. 200 GB is the maximum uncompressed capacity of a volume, 400 GB is the maximum compressed capacity *assuming you'll achieve a compression ratio of 2:1*. When your data is higly compressable, you can store more than 400 GB on a tape. When your data is already compressed, you can only store 200 GB. Since TSM doesn't know what data you'll be sending to tape, the indicated capacity of a tape is an estimate, *until* the tape is filled up. At that point, you know the exact amount of data written to the volume, so TSM changes the capacity to that amount. -- Jurjen Oskam