Date: Tue, 7 Oct 2008 10:02:29 -0400 From: "Josh Endries" <jendries@planetpyramid.com> To: <freebsd-jail@freebsd.org> Subject: RE: Performance and advice questions. Message-ID: <F3D37FF2F1A910499EA00643E2D3DEDE4D4ECC@PYRSRV1.pyramid.int> In-Reply-To: <03D72289-28DD-4DA8-A4A2-3C15AF16E995@rdc.cl> References: <03D72289-28DD-4DA8-A4A2-3C15AF16E995@rdc.cl>
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Hello, > 1.- There is any benefit to run jails in images or virtual disk ? ( > http://www.the-labs.com/FreeBSD/JailTools/README.virtual_disks Sure there are benefits. You can easily move an image around, encrypt it, copy it for a backup, etc.. There are trade-offs, though. I don't have any tests but it seems to me that this would be more prone to corruption/loss since it's all based on one huge file. A system crash and you could be in for more trouble than usual. Also, and I did test this (it's easy), performance is significantly slower when using an image file than a real filesystem. I would suggest that you mount separate filesystems/disks for your jails instead of using an image file, if possible (hooray for ZFS). If you have a ton of RAM, I suppose you could make a memory-backed filesystem though, and take snapshots. :) It may be worth looking into using a read-only memory-backed fs as your root image (e.g. in ezjail, unionfs) and mount /usr/local or whatever from a real filesystem for r/w access. Josh
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