Dear Patrick,
Thanks a lot for pointing out the HSM ticket. We will see whether we have the
resource to do something with the ticket.
I am thinking of a temporary solution for HSM using cephfs client commands. The
following command
'setfattr -n ceph.dir.layout.pool -v NewPool Folder'
will set the specified folder Folder to be written to NewPool.
If i understand correctly, the new file written to Folder will be directed to
NewPool, but how about the old files that already exist in FOLDER before
executing the above command? Should i mannually migrate those old files, and
how?
best regards,
samuel
huxia...@horebdata.cn
From: Patrick Donnelly
Date: 2021-07-21 21:51
To: huxia...@horebdata.cn
CC: ceph-users
Subject: Re: [ceph-users] How to make CephFS a tiered file system?
Hello samuel,
On Mon, Jul 19, 2021 at 2:28 PM huxia...@horebdata.cn
<huxia...@horebdata.cn> wrote:
>
> Dear Cepher,
>
> I have a requirement to use CephFS as a tiered file system, i.e. the data
> will be first stored onto an all-flash pool (using SSD OSDs), and then
> automatically moved to an EC coded pool (using HDD OSDs) according to
> threshold on file creation time (or access time). The reason for such a file
> system is due to the fact that, files are created and most likely accessed
> within the first 6 months or 1 year, and after that period, those files have
> much less chance to be accessed and thus could be moved to a slower and cheap
> pool.
>
> Does CephFS already support such a tiered feature? and if yes, how to
> implement such feature with a pool of all SSD pool and a pool of EC-coded HDD
> pool?
>
> Any suggestion, ideas, comments are highly appreciated,
We have an outstanding ticket for this but no one has yet taken it up:
https://tracker.ceph.com/issues/40285
--
Patrick Donnelly, Ph.D.
He / Him / His
Principal Software Engineer
Red Hat Sunnyvale, CA
GPG: 19F28A586F808C2402351B93C3301A3E258DD79D
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