Date: Fri, 18 Nov 2005 18:13:51 -0500 From: Parv <parv@pair.com> To: Michal Mertl <mime@traveller.cz> Cc: delphij@delphij.net, Johan =?iso-8859-1?Q?Str=F6m?= <johan@stromnet.org>, pjd@freebsd.org, freebsd-stable@freebsd.org Subject: Re: Page fault, GEOM problem?? Message-ID: <20051118231351.GA46946@holestein.holy.cow> In-Reply-To: <1132353600.903.19.camel@genius1.i.cz> References: <991F35AA-151B-4AEA-82BD-5F4AEDF28424@stromnet.org> <a78074950511180117r6d64db25o4ae37c0c5998e002@mail.gmail.com> <74994962-5050-47BD-897B-DE3880B9EBD5@stromnet.org> <a78074950511180943r57fd9d03r64efcc705001bc35@mail.gmail.com> <A6F22EE2-B1E6-44B5-B4C2-E77E1A24FEBB@stromnet.org> <1132353600.903.19.camel@genius1.i.cz>
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in message <1132353600.903.19.camel@genius1.i.cz>, wrote Michal Mertl thusly... > > Johan Ström wrote: > > > > On 18 nov 2005, at 18.43, Xin LI wrote: ... > > So, it seems it does run savecore after running dumpon and > > mounting disks etc... Is that wrong? > > No, this is normal. When you run savecore you need to have mounted > filesystems. In order to mount the filesystems they may have to be > checked. The fsck program requires big amount of memory to check > larger filesystems so the swap has to be enabled. Core dumps are > written to the dump device (swap) from the end whereas the swap is > normally used from the beginning (or the other way around). > Therefore there's quite a big chance that, even when the swap has > to be used for fsck, the core dump is intact and usable. Is there any formula to calculate the size of swap to account for fsck & core dump while assigning swap size (short of having two swap partitions)? > If the usage of the swap file by fsck corrupts the core dump you > may start after next crash in single user mode and run the > commands manually (without enabling swap). Is that after kernel (re)boots? And would the commands to be executed be savecore followed by swapon? - Parv --
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