Hi This email is in context of another thread initiated by me (with Subject: using fio to test btrfs compression). Just as brief background, I am trying to verify btrfs compression where I am writing data using fio, dd or cp command. In response to my question in another thread: > Is there any command that i can run to confirm file has been compressed? I've gotten response from Duncan: >>There is the quite recently posted (and actively updated since then) >>compsize command. >>https://github.com/kilobyte/compsize On running compsize on btrfs mount point created, I get following: Type Perc Disk Usage Uncompressed Referenced Data 50% 128K 256K 256K zlib 50% 128K 256K 256K Data 100% 10G 10G 10G none 100% 10G 10G 10G but then how do I interpret above information? if I go by each line, then Does .. 1st entry means Data 50% 128K 256K 256K - It is just raw uncompressed data but occupying only 50% of disk space w.r.t its size (may be because of its CoW or deduplication?) zlib 50% 128K 256K 256K - This is zlib compressed data occupying 50% of disk usage ? Data 100% 10G 10G 10G - This is uncompressed data with no compression/cow/deduplication occupying 100% of disk of its size? none 100% 10G 10G 10G - Did not understand how to interpret none entry here.. any help? Thanks Shally -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
