samba ceph-vfs and scrubbing interval - ceph-users

27 Mar 2020

Hi all,

i‘m running a 3 node ceph cluster setup with collocated mons and mds for actually 3
filesystems at home since mimic. I’m planning to downgrade to one FS and use RBD in the
future, but this is another story. I’m using the cluster as cold storage on spindles with
EC-pools for archive purposes. The cluster usually does not run 24/7. I actually managed
to upgrade to octopus without problems yesterday. So first of all: great job with the
release. 

Now I have a little problem and a general question to address.

I have tried to share the CephFS via samba and the ceph-vfs module but I could not manage
to get write access (read access is not a problem) to the share (even with the admin key).
When I share the mounted path (kernel module or fuser mount) instead as usual there are no
problems at all.  Is ceph-vfs generally read only and I missed this point? Furthermore I
suppose, that there is no possibility to choose between the different mds namespaces,
right?

Now the general question. Since the cluster does not run 24/7 as stated and is turned on
perhaps once a week for a couple of hours on demand, what are reasonable settings for the
scrubbing intervals? As I said, the storage is cold and there is mostly read i/o. The
archiving process adds approximately 0.5 % of new data of the cluster’s total storage
capacity. 

Stay healthy and regards,

Marco Savoca