Thank you. These are quite useful. On 01/22/2016 05:57 PM, Tomohiro Kusumi wrote: > If you are to redirect the hammer show output to a file, it's better to > write to a file on different filesystem (e.g. ufs or another hammer). > > It's possible that hammer show never ends because what hammer show does is > run through all ondisk btree nodes. Writing a file is adding nodes into the > btree of that filesystem. > > > 2016-01-23 0:44 GMT+09:00 Tomohiro Kusumi <[email protected]>: > >> (resending as i forgot to send to users@...) >> >> # hammer -v -f ${DEV} blockmap >> # hammer -v -f ${DEV} checkmap >> # hammer -v -f ${DEV} show >> >> These three do some validation from different point of view. >> If the last two lines of each output says 0 error, then no error was found >> at least by what these 3 commands test for. >> >> Note that there seems to be a bug in hammer where a valid filesystem would >> still show ^B in hammer show output. I usually run some test scripts (that >> contain there 3 commands) before I commit something, but I see ^B in hammer >> show every once in a while. It could be that the way hammer show tests the >> filesystem is missing something and results in showing errors that aren't >> really errors. This occurred at least back in DragonFly 4.0 era in 2014, >> and it still does on 4.4. It has been on my todo list for a long time. >> >> >> 2016-01-22 23:59 GMT+09:00 PeerCorps Trust Fund <[email protected]>: >> >>> Hi All, >>> >>> In ZFS, the command "zpool status" gives a succinct overview of the >>> status of mounted file systems. In particular, whether there might be >>> checksum errors on files or other data structures. >>> >>> NAME STATE READ WRITE CKSUM >>> tank ONLINE 0 0 0 >>> ada0p2 ONLINE 0 0 0 >>> >>> In HAMMER the "show" command provides an extremely detailed output of all >>> data structures and CRC verifications. >>> >>> I've used the command: >>> >>> hammer -f /dev/serno/disk-serial-number show |grep B------ >>> >>> On a mounted disk and the output was clean (nothing) after running for >>> some time with noted disk activity. Does this mean that all CRCs are valid? >>> Are there other commands in addition to "show" that allow for validation >>> and examination of data structures on HAMMER volumes? >>>
Mike
