HAMMER, disk mirroring and secure NFS

Tomohiro Kusumi kusumi.tomohiro at gmail.com
Sun Mar 26 08:34:52 PDT 2017

Yes, PFS is a some sort of namespace within a fs. People usually have
wrong assumption that it's something equivalent of something in ZFS.
But PFS is less important nowadays after dillon@ made a change to
installation about a year ago.

I once wrote this just as a post to this ml, though it's not really
anything useful for regular users.

2017-03-26 17:23 GMT+03:00 Jasse Jansson <jasse at yberwaffe.com>:
> On 2017-03-26 15:59, Tomohiro Kusumi wrote:
>>> A PFS is more like a namespace, I got that.
>> It's a logical separation within HAMMER's B-Tree. Things
>> (inode/dirents/data/etc) that belong to PFS#1 are logically clustered
>> within the tree, and the same for PFS#2,3,4,etc. The only different
>> one is PFS#0 which is what you have by default after newfs_hammer.
>> PFS#0 includes all the other PFSes. Having logically clustered
>> sub-tree and exported to userspace via PFS symlink makes
>> mirror-copy/etc easier to implement when there are certain target
>> directories that you want to copy to/from.
> Sounds like some sort of namespace to me but I get the point.
> But you seems to have great knowledge about this so feel free to write the
> missing doc to enlighten the rest uf us.

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