Date: Thu, 09 Oct 2014 18:53:52 -0400 From: Daniel Staal <DStaal@usa.net> To: FreeBSD Questions <freebsd-questions@freebsd.org> Subject: Re: Next Steps to Debug ZFS Hang? Message-ID: <D06BCA779173763DDF3CD614@[192.168.1.50]> In-Reply-To: <CAM72HBZvpXSeVMjQvWGiKhqeosMzxDBr9zAFJ8h7QByfhd7%2BUQ@mail.gmail.com> References: <1412732931033.813626ca@Nodemailer> <DAA5D9129F9D691C69C7A2EF@192.168.1.50> <CAM72HBZvpXSeVMjQvWGiKhqeosMzxDBr9zAFJ8h7QByfhd7%2BUQ@mail.gmail.com>
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--As of October 8, 2014 9:28:05 PM -0700, Nick Sivo is alleged to have said: >> Not sure if this will be helpful, but at least it shouldn't hurt: When >> was the last time you ran a scrub? Also, how much RAM do you have and >> where is your swap? (The only times I've had permanent hangs from ZFS >> was when I ran out of RAM and was trying to swap to ZFS...) > > The server has 64GB ECC RAM, and no swap at the moment. I've since > rebooted the box, but a scrub today revealed no errors, and there was > nothing in the console or any log files about disk or controller > errors or timeouts. --As for the rest, it is mine. Note that I'm still just going by 'standard checks', but why don't you have any swap? I know you probably wouldn't use it with that much RAM around, but FreeBSD still performs better with it - and it wouldn't surprise me completely if that was causing your issue. (It shouldn't, in an ideal world - but it's an oddity on your system that might be causing issues, if there's an uncovered corner case.) Setting up a small ramdisk for swap - or even putting some small swap-on-zfs - might be worth checking to see if it seems to prevent the issue. (Note that swap-on-zfs has a 'worst case' scenario that crashes the box if you run out of RAM. It's happened to me, and I was able to recover, but it took a while.) Anyway, I'm mostly trying to keep your question alive in hopes that someone who's more knowledgeable can answer it. ;) Daniel T. Staal --------------------------------------------------------------- This email copyright the author. Unless otherwise noted, you are expressly allowed to retransmit, quote, or otherwise use the contents for non-commercial purposes. This copyright will expire 5 years after the author's death, or in 30 years, whichever is longer, unless such a period is in excess of local copyright law. ---------------------------------------------------------------
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