hammer-mirror question of hammer1 and hammer2

lhmwzy lhmwzy at gmail.com
Sun May 4 23:22:07 PDT 2014

In fact I want to know if a  hammer2 pfs could mirror to another mounted
read-write hammer2 pfs.

2014-05-04 21:23 GMT+08:00 Sven Gaerner <sgaerner at gmx.net>:

> On Sun, May 04, 2014 at 08:31:38AM +0800, lhmwzy wrote:
> >     In hammer1,the target of hammer-mirror must be a hammer pfs
> slave,which
> > means that the target can't be mounted and  lived show the source hammer
> > pfs master changes.
> >     For example,if the hammer pfs master is down,the mirror hammer pfs
> > slave will not online automaticly which like a cluster filesystem will
> do.
> >
> >     I read the hammer2 design document and find that hammer2 can do
> this,am
> > I correct?
> >
> >     All things I want is hammer-mirror run between many hammer pfs, each
> > hammer pfs can be mounted with read (and write) mode while a ongoing
> > hammer-mirror.
> >
> > Sorry for my bad english.I wish you could understand what I have say.
> You can only access a PFS slave in read-only mode. You have to upgrade
> (hammer pfs-upgrade) a PFS slave to a PFS master to also allow
> read-write access. But then you cannot use mirror-copy to update this
> master PFS. The hammer mirror-copy works only from one PFS master to
> many PFS slaves.
> But you can use mirror-stream to continuously update your PFS slave from
> you PFS master, while at least the master is in use.
> Automatically replacing a going down PFS master with one of its PFS
> slave might be possible, but this will manual work. I don't know if
> there is a out-of-the-box solution.
> In hammer2 this might change (I did not follow the latest changes in the
> development), but AFAIK hammer2 is still under heady development.
> Sven
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