[zfs-discuss] sending stream too slow on busy system

Ovi Chis sonekken at gmail.com
Mon May 23 15:38:32 EDT 2016


Have a look at mbuffer. I've used it and it seems to speed up replication
considerably


On Mon, May 23, 2016 at 2:54 PM, Paul Dagnelie via zfs-discuss <
zfs-discuss at list.zfsonlinux.org> wrote:

> First, what version are you running?  zfs send has been going through some
> changes lately, and the tunables are changing with it.  Second, you
> probably want to look into resumable send/recv; if your send is going to
> take a week, you don't want to have to restart on day 6 because your
> network dropped some packets on the floor.
>
> On Sun, May 22, 2016 at 5:29 PM, David Bruzos via zfs-discuss <
> zfs-discuss at list.zfsonlinux.org> wrote:
>
>> Hello all:
>> I have a reasonably busy system that I need to stream about a TB of data
>> from in order to migrate some virtual machines to a remote site, but the
>> zfs send is really slow.  A similar machine with no VMs running seems to
>> send about 10-15 times faster than the busy box.
>> My plan is to do an initial send and then a final incremental send, in
>> order to cut the down time to a minimum, but at this rate, it will take me
>> a week to complete the initial send.  Of course, something is likely to go
>> wrong during this long time, so I'll have to start over.
>>
>> What are some tunable parameters that can increase ZFS streaming
>> performance that I can play with while the system is up and running and are
>> not likely to cause some kind a nasty crash and/or sideaffect?
>>
>> Thanks!
>>
>> David
>>
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>> zfs-discuss at list.zfsonlinux.org
>> http://list.zfsonlinux.org/cgi-bin/mailman/listinfo/zfs-discuss
>>
>
>
>
> --
> Paul Dagnelie
>
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>
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