Date: Thu, 18 May 2023 16:04:46 -0400 From: Aryeh Friedman <aryeh.friedman@gmail.com> To: Tomek CEDRO <tomek@cedro.info> Cc: FreeBSD Mailing List <freebsd-questions@freebsd.org>, freebsd-emulation@freebsd.org Subject: Re: How is this possible Message-ID: <CAGBxaX=ezudnof5sn2r0HvHQeqUo9AUBDerYdbOASC5p4ZGgyQ@mail.gmail.com> In-Reply-To: <CAFYkXjnm0XhdYJHRa%2BU0GJXafrSxbrnvY1GdxcLKzO_UUhAR_g@mail.gmail.com> References: <CAGBxaXm0f=fOm2vJOjTpe0rjNq-OLFT2ww0-eOb5HLDn9afVeQ@mail.gmail.com> <CAFYkXjmf%2Bw9GcXOtPWcSXXdn3rAf_92iUnT%2Bv4%2B=PR5rbLFf6A@mail.gmail.com> <CAGBxaXkxm-bqLJthccMrfAWrF0yPnZ=bZAWKaTLW=O_YazWWtw@mail.gmail.com> <CAFYkXjnm0XhdYJHRa%2BU0GJXafrSxbrnvY1GdxcLKzO_UUhAR_g@mail.gmail.com>
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On Thu, May 18, 2023 at 3:03=E2=80=AFPM Tomek CEDRO <tomek@cedro.info> wrot= e: > > On Thu, May 18, 2023 at 8:51=E2=80=AFPM Aryeh Friedmanwrote: > > On Thu, May 18, 2023 at 2:48=E2=80=AFPM Tomek CEDRO wrote: > > > If you create a ramdisk and build there it will be even faster.. > > > assuming space is enough (kernel should go, not sure about world).. I > > > have tried with 128GB RAM and it works quite well on older hardware.. > > > similar to newer hardware with 32GB RAM and nvme disk :-) > > > > See other replies two identical SSD's (same model number and capacity) > > backing both the physical OS and VM's OS (each on a different drive). > > As to NVM I still don't trust it even though it has been around for 7 > > or 8 years now (too much experience with OS wackiness with high end > > storage networking) > > True :-) I have additional nvme pci-e controller and fast nvme drive > as my OS storage.. on an older machine.. it really blows my sock off > (faster than SATA SSD).. but the raidz2 uses WD RED Pro 4x4TB HDD for > more important stuff and zfs stripe on WD RED 2x2TB as scratchpad :-P See below for ZFS problems... we purposely decided to not do anything fancier then mirroring and only then so one the drives can safely be backed up > > It would be good to know the VM (bhyve?) and host fs (ZFS?) and the vm > fs (UFS?) :-) I have noticed after switching to ZFS that my raid was a > lot faster on UFS.. but I had consistency errors on crash which now I > do not have with ZFS and I have really nice features now for instance > snapshots and amazingly flexible pools allocation :-) The machine this is replacing (hard crashed a few days ago) was ZFS and frankly ZFS posed more of a problem then a solution for restoring at the virtual drive level (zpool scrub cleared the error but corrupted the virtual drive then once I get the OS reinstalled it started spontaniously rebooting while doing a make -j12 DESTDIR=3D/ and thus the new machine).... due to problems with ZFS I decided to use UFS this time and rely of more traditional backups the ZFS as primary backups --=20 Aryeh M. Friedman, Lead Developer, http://www.PetiteCloud.org
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