On 23/03/2020 20:50, Jeff Layton wrote:
On Mon, 2020-03-23 at 15:49 +0200, Maged Mokhtar wrote:
Hello all,
For multi-node NFS Ganesha over CephFS, is it OK to leave libcephfs write caching on, or should it be configured off for failover ?
You can do libcephfs write caching, as the caps would need to be
recalled for any competing access. What you really want to avoid is any
sort of caching at the ganesha daemon layer.
Hi Jeff,
Thanks for your reply. I meant caching by libcepfs used within the
ganesha ceph fsal plugin, which i am not sure from your reply if this is
what you refer to as ganesha daemon layer (or does the later mean the
internal mdcache in ganesha). I really appreciate if you can clarify
this point.
I really have doubts that it is safe to leave write caching in the
plugin and have safe failover, yet i see comments in the conf file such as:
# The libcephfs client will aggressively cache information while it
# can, so there is little benefit to ganesha actively caching the same
# objects.
Or is it up to the NFS client to issue cache syncs and re-submit writes
if it detects failover ?
Appreciate your help. /Maged
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