I am upgrading our tape drives from LTO-3 to LTO-5. The native uncompressed capacity of LTO-3 tape is 400GigaBytes. The native uncompressed capacity of LTO-5 tape is 1.5 TeraBytes.
I have always used the compressed mode on the current LTO-3. And you can get 2 times or more compression. According to the docs and the output from butc the max tape size in the /usr/afs/backup/tapeconfig file is 2TB. I set to 8TB and labeled a tape and it appears to be limited to 2TB as shown below. I do a full dump then append the incrementals to the same tape. Does anyone have a recommendation on the tapeconfig settings for LTO-5? Also is there a recommended setting for the BUFFERSIZE in the /usr/afs/backup/CFG_st0 file for LTO-5 tape drives? Thanks for any help on this matter. Here is the tapeconfig for our LTO-3 drives: 1500G 0 /dev/st0 0 and the CFG_st0 setting: BUFFERSIZE 16M Tried this for the new LTO-5 drive: 8T 0 /dev/st0 3 and get this butc output when labeling a LTO-5 tape: Labeltape ******* OPERATOR ATTENTION ******* Device : /dev/st0 Please put in tape to be labelled as <NULL> and hit return when done Thanks, now proceeding with tape labelling operation. ********************************** Tape blocks read in 10240 Byte chunks. Labelled tape <NULL> size 2147483648 Kbytes -- John W. Sopko Jr. University of North Carolina email: sopko AT cs.unc.edu Computer Science Dept., CB 3175 Phone: 919-962-1844 Fred Brooks Building; Room 140 Fax: 919-962-1799 Chapel Hill, NC 27599-3175
