[OpenIndiana-discuss] Antwort: Transferring everything in one zpool to be a, subtree in another larger zpool (Hans J. Albertsson)

[Hans J Albertsson]

Hear hear!

Hans J. Albertsson
>From my Nexus 5
Den 5 maj 2015 22:36 skrev "Timothy Coalson" <tsc5yc at mst.edu>:

> If you transfer many snapshots, especially if some are small, there is a
> benefit from buffering: the receive end, after each snapshot, stops
> consuming data, possibly for several seconds.  Without a buffer, this will
> stall the sending side, so that nothing gets done during those pauses.  I
> have put a small buffer on the sending side and a larger buffer on the
> receiving side (as ssh is my current bottleneck, from encryption as you
> note, but it is fairly close to the network speed anyway), and it helps get
> things finished faster.
>
> Tim
>
>
> On Tue, May 5, 2015 at 8:32 AM, Doug Hughes <doug at will.to> wrote:
>
> > you can also use ttcp or iperf just fine. I do that all the time and they
> > are pretty much available anywhere. (ttcp is so simple it's just a single
> > .c source file). The buffering isn't really the important part, using as
> > close to raw tcp transport gets you the biggest benefit (vs
> > encryption/decryption overhead and slowdown).
> >
> >
> > Sent from my android device.
> >
> > -----Original Message-----
> > From: "Hans J. Albertsson" <hans.j.albertsson at gmail.com>
> > To: Discussion list for OpenIndiana <openindiana-discuss at openindiana.org
> >
> > Sent: Tue, 05 May 2015 9:31
> > Subject: Re: [OpenIndiana-discuss] Antwort: Transferring everything in
> one
> > zpool to be a, subtree in another larger zpool (Hans J. Albertsson)
> >
> > mbuffer isn't included in FreeNAS.
> >
> > It IS available for FreeBSD, but I don't know if that version will
> > behave responsibly in FreeNAS.
> >
> > FreeNAS devs say "mbuffer won't be included in FreeNAS because we
> > already do proper buffering via dd."
> >
> > Would dd work for buffering in Solaris/OI??
> >
> > On 2015-05-05 14:26, Sebastian Gabler wrote:
> > > Am 05.05.2015 um 14:00 schrieb
> > > openindiana-discuss-request at openindiana.org:
> > >> As a side note; just piping to ssh is excruciatingly slow, using
> netcat,
> > >> "nc", speeds things up at least 4fold.
> > > The method that worked fine for me was using mbuffer. (I couldn't make
> > > netcat work, shame on me, but I also remember that there were several
> > > pros of using mbuffer. I think one of them was the ability to use
> > > digest to secure the transfer.)
> > >
> > > See:
> > >
> >
> http://everycity.co.uk/alasdair/2010/07/using-mbuffer-to-speed-up-slow-zfs-send-zfs-receive/
> > >
> > > That being said, it's exactly two years when I last did a migration
> > > with zfs send | zfs receive. I hope that still works.
> > >
> > > BR,
> > >
> > > Sebastian
> > >
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> >
> >
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