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 -------------- next part -------------- A non-text attachment was scrubbed... Name: not available Type: application/pgp-signature Size: 819 bytes Desc: not available URL: <http://lists.freebsd.org/pipermail/freebsd-stable/attachments/20150724/e9cac3a4/attachment.bin>
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... -- Michelle Sullivan http://www.mhix.org/
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 >...more RAM? Always more RAM? Reality check please, this is an i386 Machine with 2 Gbytes. It has two of 3 sockets polluted with RAM Modules (1G), there is not that much Space to give it more RAM. i386 is a supported architecture as far as I know, ok it where nice to have in i386 with 8 Gigs of RAM but there are not much motherboards out here that would support this.. This remebers me to microsofts attemts to write Software, always more RAM and more CPU to fasten up endless loops.. Regards, Holm -- Technik Service u. Handel Tiffe, www.tsht.de, Holm Tiffe, Freiberger Stra?e 42, 09600 Obersch?na, USt-Id: DE253710583 www.tsht.de, info at tsht.de, Fax +49 3731 74200, Mobil: 0172 8790 741