Date: Fri, 4 Mar 2011 12:13:58 +0000 From: Tom Evans <tevans.uk@googlemail.com> To: Dr Josef Karthauser <joe@tao.org.uk> Cc: freebsd-fs@freebsd.org Subject: Re: ZFS on a single disk? Message-ID: <AANLkTinp5-kHGePPtyiruxKVhWcioRrGwMAYe%2BygK76M@mail.gmail.com> In-Reply-To: <9EAE56CB-0CE9-4A08-B783-3EF9B1059E62@tao.org.uk> References: <0E00DAFC-C39F-47DC-B9AF-16419C20997F@tao.org.uk> <615F1346-E830-42E2-B229-4181B8BC56BD@exonetric.com> <53FA69D2-2EF0-4CBF-985B-6E710F15FE02@tao.org.uk> <20110302001650.GB49147@icarus.home.lan> <27423168-85BE-41B1-8E14-94F01310EFE4@tao.org.uk> <20110302121612.GA61020@icarus.home.lan> <9EAE56CB-0CE9-4A08-B783-3EF9B1059E62@tao.org.uk>
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On Fri, Mar 4, 2011 at 12:01 PM, Dr Josef Karthauser <joe@tao.org.uk> wrote= : > On 2 Mar 2011, at 12:16, Jeremy Chadwick wrote: > >> On Wed, Mar 02, 2011 at 10:28:50AM +0000, Dr Josef Karthauser wrote: >>> >>> I guess I should have been a bit clearer, I mean without any external >>> devices backing them. Seeing as this is to be running on a VPS/Xen at >>> a hosting environment I'm not able to add any additional devices. I'm >>> not memory starved however. Is it madness to use a memory disk? (The >>> instance in question will have 6gb of ram total to play with.). >> >> Again: don't disable the ZIL, and adjust the ARC to whatever size you >> want using a combo of vm.kmem_size and vfs.zfs.arc_max. =C2=A0Make use o= f the >> RAM you have available to you. =C2=A0:-) >> > > Ok. That sounds like a plan. > > Next question, if I may. It looks like a XENHVM environment is unavailabl= e > to me, so I'm going have to stick with i386, and PAE to make the addition= al > memory available. Given this constraint, does it still make sense to be > trying to use ZFS? I had imagined that with 6GB to play with, I could > dedicate 2GB of kernel space to the ZFS, leaving most of the rest for use= r > land to play with. I've never played with PAE so I don't know whether I'm > making any stupid assumptions here. > > Could I be, or is this still a sensible configuration to be thinking abou= t? > > The grand picture is something like this then: > > - Hardware environment: XEN with 6GB ram, ample processor, 80GB disk. > - O/S environment: FreeBSD 8.2 + PAE + XEN_PV + ZFS. > - Goal: Host a number of ZFS managed jails in a secure and reliable way. > > Am I asking for trouble, or am I on the money? > > Joe > > p.s. there are some HVM XEN hosts out there, but it looks like they're al= l > _much_ more expensive that the hosting provider that I'm considering, whi= ch > appears to be offering a sweet spot of memory/cost. PAE? What is this, the 90s? ;) i386 + ZFS is not a wise move IMO. Any reason why you cannot use amd64? Cheers Tom
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