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
huxiaoyu@xxxxxxxxxxxx
From: Patrick Donnelly
Date: 2021-07-21 21:51
To: huxiaoyu@xxxxxxxxxxxx
CC: ceph-users
Subject: Re: How to make CephFS a tiered file system?
Hello samuel,
On Mon, Jul 19, 2021 at 2:28 PM huxiaoyu@xxxxxxxxxxxx
<huxiaoyu@xxxxxxxxxxxx> 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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