Date: Mon, 16 Mar 2015 11:54:52 -0400 From: Michael Jung <mikej@mikej.com> To: John Baldwin <jhb@freebsd.org> Cc: owner-freebsd-stable@freebsd.org, freebsd-stable@freebsd.org, Brandon Allbery <allbery.b@gmail.com>, Michael BlackHeart <amdmiek@gmail.com> Subject: Re: savecore problem Message-ID: <2142548d6fac1894597a45a042966c7a@mail.mikej.com> In-Reply-To: <2959054.c91S7azMUP@ralph.baldwin.cx> References: <CA%2BAz77No%2B0k=S4xq5MPK-YEgm7HGh%2B%2BSBNRHeV0hHq7AqOc0Tw@mail.gmail.com> <CAKFCL4WHjJsPGMd_jRx9h48D%2Be1md%2B_c3wY9N6u_9=unq=cdhw@mail.gmail.com> <2959054.c91S7azMUP@ralph.baldwin.cx>
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On 2015-03-16 11:23, John Baldwin wrote: > On Monday, March 16, 2015 10:17:54 AM Brandon Allbery wrote: >> On Mon, Mar 16, 2015 at 9:40 AM, Michael BlackHeart >> <amdmiek@gmail.com> >> wrote: >> >> > Hello there. I've got a problem. Recently my personal server issued a >> > kernel panic. Then there's a dump and so on. But there's no dump >> > information after reboot. I do not know what was really the panic cause but >> > assume that savecore failed because of RAID. >> > >> > Problem - minidump was done (I saw it was) but was not recovered by >> > savecore after reboot into /var/vrash >> > >> (...) >> >> > /dev/ufs/varfs /var ufs rw,noatime >> > 2 2 >> > >> >> Last I checked, savecore had to happen very early --- before >> filesystems >> other than / are mounted. > > No, it can happen after that. What really has to happen is that you > don't > use swap (if you are dumping to your swap partition) before savecore > runs. Can someone elaborate on not using swap as a dump device a little more? I have had instances in the past were I had issues with getting a core dump and resorted to a dedicated dump device but didn't investigate further nor have I read this as a requirement. A second question - Can a USB devices be used reliably for a dump device for ZFS on boot systems? Regards, Michael Jung
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