> On 9 May 2019, at 00:55, Michelle Sullivan <miche...@sorbs.net> wrote: > > > > This is true, but I am of the thought in alignment with the zFs devs this > might not be a good idea... if zfs can’t work it out already, the best thing > to do will probably be get everything off it and reformat…
That’s true, I would rescue what I could and create the pool again but after testing the setup thoroughly. It would be worth to have a look at the excellent guide offered by the FreeNAS people. It’s full of excellent advice and a priceless list of “donts” such as SATA port multipliers, etc. > >> That sound not be hard to write if everything else on the disk has no >> issues. Don't you say in another message that the system is now returning >> 100's of drive errors. > > No, one disk in the 16 disk zRAID2 ... previously unseen but it could be the > errors have occurred in the last 6 weeks... everytime I reboot it started > resilvering, gets to 761M resilvered and then stops. That’s a really bad sign. It shouldn’t happen. >> How does that relate the statement =>Everything on >> the disk is fine except for a little bit of corruption in the freespace map? > > Well I think it goes through until it hits that little bit of corruption at > stops it mounting... then stops again.. > > I’m seeing 100s of hard errors at the beginning of one of the drives.. they > were reported in syslog but only just so could be a new thing. Could be > previously undetected.. no way to know. As for disk monitoring, smartmontools can be pretty good although only as an indicator. I also monitor my systems using Orca (I wrote a crude “devilator” many years ago) and I gather disk I/O statistics using GEOM of which the read/write/delete/flush times are very valuable. An ailing disk can be returning valid data but become very slow due to retries. Borja. _______________________________________________ freebsd-stable@freebsd.org mailing list https://lists.freebsd.org/mailman/listinfo/freebsd-stable To unsubscribe, send any mail to "freebsd-stable-unsubscr...@freebsd.org"
