On Fri, Jul 24, 2015 at 02:54:00AM +0200, Michelle Sullivan wrote: > Glen Barber wrote: > > On Thu, Jul 23, 2015 at 07:44:43PM -0500, Mark Linimon wrote: > > > >> On Fri, Jul 24, 2015 at 12:43:43AM +0000, Glen Barber wrote: > >> > >>> Even on amd64, you need to tune the system with less than 4GB RAM. > >>> > >> The only correct answer to "how much RAM do you need to run ZFS" is > >> "always more" AFAICT. > >> > >> > > > > There's a bit more to it than that. You *can* successfully run amd64 > > ZFS system with certain tunings (vfs.kmem_max IIRC), but you also need > > to adjust things like disabling prefetching with less than 4GB RAM > > (accessible to the OS). > > > > So yeah, "more RAM" is always a thing in this playing field. > > > > Glen > > > > > Actually I'm quite sucessfully running zfs on i386 (in a VM) ... here's > the trick (which leads me to suspect ARC handling as the problem) - when > I get to 512M of kernel space or less than 1G of RAM available system > wide, I export/import the zfs pool... Using this formula I have uptimes > of months... I haven't yet tried the 'ARC patch' that was proposed > recently... >
Which FreeBSD version is this? Things changed since 10.1-RELEASE and what will be 10.2-RELEASE enough that I can't even get a single-disk ZFS system (in VirtualBox) to boot on i386. During 10.1-RELEASE testing, I only saw problems with multi-disk setup (mirror, raidzN), but the FreeBSD kernel grew since 10.1-RELEASE, so this is not unexpected. Glen
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