Re: ZFS on high-latency devices
- Reply: George Michaelson : "Re: ZFS on high-latency devices"
- Reply: Lev Serebryakov : "Re: ZFS on high-latency devices"
- Reply: Peter Jeremy : "Re: ZFS on high-latency devices"
- In reply to: George Michaelson : "Re: ZFS on high-latency devices"
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Date: Sun, 22 Aug 2021 23:48:13 UTC
mbuffer is not going to help the OP. He's trying to create a pool on top of a networked block device. And if I understand correctly, he's connecting over a WAN, not a LAN. ZFS will never achieve decent performance in such a setup. It's designed as a local file system, and assumes it can quickly read metadata off of the disks at any time. The OP's best option is to go with "a": encrypt each dataset and send them with "zfs send --raw". I don't know why he thinks that it would be "very difficult". It's quite easy, if he doesn't care about old snapshots. Just: $ zfs create <crypto options> pool/new_dataset $ cp -a pool/old_dataset/* pool/new_dataset/ -Alan On Sun, Aug 22, 2021 at 5:40 PM George Michaelson <ggm@algebras.org> wrote: > I don't want to abuse the subject line too much, but I can highly > recommend the mbuffer approach, I've used this repeatedly, BSD-BSD and > BSD-Linux. It definitely feels faster than SSH, since the 'no cipher' > options were removed, and in the confusion of the HPC buffer changes. > But, its not crypted on-the-wire. > > Mbuffer tuning is a bit of a black art: it would help enormously if > there was some guidance on this, and personally I've never found the > mbuffer -v option to work well: I get no real sense of how full or > empty the buffer "is" or, if the use of sendmsg/recvmsg type buffer > chains is better or worse. > > -G > > On Fri, Aug 20, 2021 at 6:19 PM Ben RUBSON <ben.rubson@gmx.com> wrote: > > > > > On 19 Aug 2021, at 11:37, Peter Jeremy <peter@rulingia.com> wrote: > > > > > > (...) or a way to improve throughput doing "zfs recv" to a pool with a > high RTT. > > > > You should use zfs send/receive through mbuffer, which will allow to > sustain better throughput over high latency links. > > Feel free to play with its buffer size parameters to find the better > settings, depending on your link characteristics. > > > > Ben > > > > > >