hammer slave

[Tomohiro Kusumi]

Note that for slave pfs, if you are to newly create one by pfs-slave,
you can not either cd, stat or mount it until you once sync with
a master.

This is because a slave doesn't have a root inode (root directory)
right after initialization.

It does have a pfs meta data that identifies the existence of the
slave pfs (@@0x00000... thing you see on readlink(2)), but it's
different from that slave filesystem being mountable.


# hammer pfs-slave slave > /dev/null
# file ./slave/
./slave/: cannot open `./slave/' (No such file or directory)
# cd ./slave/
cd: no such file or directory: ./slave/
# mount_null ./slave /mnt
mount_null: /HAMMER/@@0x0000000000000001:00002: No such file or directory
# hammer pfs-update slave shared-uuid=337aa2d9-ea95-11e4-9a6a-75d435a9db68
> /dev/null
# hammer mirror-copy ./master ./slave
Prescan to break up bulk transfer
Prescan 1 chunks, total 0 MBytes (208)
Mirror-read ./master succeeded
# file ./slave/
./slave/: directory
# cd ./slave/
# cd ..
# mount_null ./slave /mnt
# mount | grep /mnt
/HAMMER/@@0x00000001000080e0:00002 on /mnt (null)


2015-04-21 21:42 GMT+09:00 <nans_nans1 at yahoo.de>:

> I create a hammer slave with "hammer -v mirror-stream /pfs/master
> /pfs/slave"
> Is it necessary to create a softlink "ln -s /pfs/slave /somewhere" or
> mountpoint "mount_null /pfs/slave /mnt/slave" to access the hammer slave?
> Or can i directly access the hammer slave with "cd /pfs/slave"?
>
> What about the master? The same questions as above.
>
> (Sorry for my incredibly bad english)
>
>
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