Date: Mon, 6 Dec 2010 13:42:23 -0800 From: Jeremy Chadwick <freebsd@jdc.parodius.com> To: Ronald Klop <ronald-freebsd8@klop.yi.org> Cc: freebsd-fs@freebsd.org Subject: Re: How to choose the size of swap? Message-ID: <20101206214223.GA6375@icarus.home.lan> In-Reply-To: <op.vm872qsr8527sy@pinky> References: <4CFBD7F9.3000307@ukr.net> <op.vm872qsr8527sy@pinky>
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On Sun, Dec 05, 2010 at 07:53:04PM +0100, Ronald Klop wrote: > On Sun, 05 Dec 2010 19:20:41 +0100, Vladislav V. Prodan > <universite@ukr.net> wrote: > > >We have several servers with 8|16 GB of memory, 2|4 harddrive > >(RAID1|RAID10 using ZFS) > >These servers will work with Mysql, the size of databases that are > >several times larger than the size of memory. > > > >What would recommend to expose the size of swap? > >On a separate partition or a file? > >At hand is not loaded with servers that have the swap was over 20 MB ... > >In an extreme case, let the output "top v" to this maillist > > You might not need swap to run the database. But the swap space is > also used for making a kernel dump in case of a problem. In that > case swap space must be as large as the amount of memory in the > machine. (As far as I know.) And don't forget that (by default) you'll need a /var filesystem that has enough physical room to hold the dump. You can change this using the "dumpdir" option in rc.conf(5) if your existing /var isn't large enough. Just make sure to copy /var/crash to /wherever, and make sure the file/dir permissions are correct + minfree file exists. -- | Jeremy Chadwick jdc@parodius.com | | Parodius Networking http://www.parodius.com/ | | UNIX Systems Administrator Mountain View, CA, USA | | Making life hard for others since 1977. PGP: 4BD6C0CB |
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