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Re: ibm lto 6 format media without compression

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Jerzy Zbyslaw
Re: ibm lto 6 format media without compression
on Mar 22, 2019 at 12:06:07 pm

I don't see what the big deal with compression is because its transparently done by the drive itself and every drive understands it so there's no chance that a compressed tape won't be readable anytime in the future unlike some proprietary compression algorithms some backup programs use. You don't lose anything by having it on because the drive determines if the data is compressible and if it isn't it just simply writes out the raw data, either way it writes out a flag to say whether the next record is compressed or not and reading the tape simply involves reading the flag and processing the data by uncompressing it accordingly if needs be. I guess the only negative is if someone gets accustomed to say writing 3TB of compressible data to a 2.5TB LTO6 tape and the next time they try to write out 3TB of uncompressible data to the same tape and then find out it doesn't fit but other than that there aren't any other negatives that I can see so perhaps you can advise them their concerns are unfounded, anyway to answer your question try doing what this article here says https://www.ibm.com/support/knowledgecenter/en/linuxonibm/com.ibm.linux.z.l... however, it may be turned on in LTFS so there may be a setting you may need to clear when you format the tape like this https://i.imgur.com/Hb4fYNs.png


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