6:36 a.m.
Is it possible to force nfs-ganesha to close all currently open fds within the cache using
signal, configuration, dbus or any other way?
8:39 a.m.
You can unexport all the exports. That's about it. We cannot close FDs
when the client has open state, as this could result in data corruption.
Daniel
On 12/16/20 7:36 AM, Yoni K wrote:
Is it possible to force nfs-ganesha to close all currently open fds
within the cache using signal, configuration, dbus or any other way?
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12:19 p.m.
Hi Daniel,
Is there away to configure Ganesha so that the LRU reaper thread would close all open FDs
older the some pre-configured duration?
Regards,
Gershon.
12:57 p.m.
No. We can't close FDs associated with client state, as that could
cause data corruption. We can only close anonymous FDs, which we do in
the background.
Daniel
On 12/16/20 1:19 PM, gershon geva wrote:
Hi Daniel,
Is there away to configure Ganesha so that the LRU reaper thread would close all open FDs
older the some pre-configured duration?
Regards,
Gershon.
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1:10 p.m.
No. We can't close FDs associated with client state, as that
could cause data
corruption. We can only close anonymous FDs, which we do in the background.
And while those aren't closed based on age of the fd, they are closed based on least
recent usage so an old anonymous fd that is being continuously used will remain open.
Retaining open file descriptors is good for at least some file systems.
Note that with NFSv4 (or 9P), for the most part, the only open fd will correspond to an
actual open file on the client.
Frank
On 12/16/20 1:19 PM, gershon geva wrote:
> Hi Daniel,
>
> Is there away to configure Ganesha so that the LRU reaper thread would close
all open FDs older the some pre-configured duration?
>
> Regards,
> Gershon.
> _______________________________________________
> Support mailing list -- support(a)lists.nfs-ganesha.org To unsubscribe
> send an email to support-leave(a)lists.nfs-ganesha.org
>
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2:27 p.m.
It would be great to be able to force close FDs for NFSv3.
On Wed, Dec 16, 2020 at 2:10 PM Frank Filz <ffilzlnx(a)mindspring.com> wrote:
> No. We can't close FDs associated with client state, as
that could
cause data
> corruption. We can only close anonymous FDs, which we do in the
background.
And while those aren't closed based on age of the fd, they are closed
based on least recent usage so an old anonymous fd that is being
continuously used will remain open. Retaining open file descriptors is good
for at least some file systems.
Note that with NFSv4 (or 9P), for the most part, the only open fd will
correspond to an actual open file on the client.
Frank
> On 12/16/20 1:19 PM, gershon geva wrote:
> > Hi Daniel,
> >
> > Is there away to configure Ganesha so that the LRU reaper thread would
close
> all open FDs older the some pre-configured duration?
> >
> > Regards,
> > Gershon.
> > _______________________________________________
> > Support mailing list -- support(a)lists.nfs-ganesha.org To unsubscribe
> > send an email to support-leave(a)lists.nfs-ganesha.org
> >
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send an
> email to support-leave(a)lists.nfs-ganesha.org
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5:25 a.m.
What qualifies as an anonymous FD? and assuming we only refer to those FDs, is it possible
to configure a more aggressive background reaping process that would close them all within
a pre-configured time?
8:27 a.m.
An anonymous FD is one used by NFSv3 read/write (but not lock), or
explicitly as an anonymous FD in NFSv3. All normal NFSv4 I/O and all
locks in both protocols need to have FDs kept open for the duration of
the client operation.
It's not impossible to force close anonymous FDs, but why do you want to
do that? We close them in the background, and it's tunable with many
option in the MDCACHE block. What behavior do you need that the current
system doesn't provide?
Daniel
On 12/17/20 6:25 AM, gershon geva wrote:
What qualifies as an anonymous FD? and assuming we only refer to
those FDs, is it possible to configure a more aggressive background reaping process that
would close them all within a pre-configured time?
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10:45 a.m.
Hi Daniel,
We run Ganesha on top of our proprietary filesystem WekaFS. Some of our filesystem
background cleanup tasks requires that all FDs on a given export be closed. Our current
NFS implementation closes all open anonymous FDs after a pre-configured time period and
allow those tasks to run when the NFS activity is relatively idle. We wish to have more or
less the same behavior with Ganesha.
7:47 a.m.
Okay, I understand the reasoning. This is inherently impossible with
NFSv4, since the protocol specification itself requires that FDs remain
open as long as the client is using them. Similarly, it's impossible
with any kind of locking (either NFSv3 or NFSv4), since, on linux, you
must keep your FD open for the lock to continue to exist.
For straight, non-locking NFSv3, it's possible, but it's not currently
implemented. The FD closing threads in Ganesha are not designed to
close all anonymous FDs, but rather to keep the number of open anonymous
FDs low. Work could be done to close them all, but no code exists
currently.
Daniel
On 12/19/20 11:45 AM, gershon geva wrote:
Hi Daniel,
We run Ganesha on top of our proprietary filesystem WekaFS. Some of our filesystem
background cleanup tasks requires that all FDs on a given export be closed. Our current
NFS implementation closes all open anonymous FDs after a pre-configured time period and
allow those tasks to run when the NFS activity is relatively idle. We wish to have more or
less the same behavior with Ganesha.
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11:38 p.m.
I thought setting the low percentage (FD_LWMark_Percent) to zero makes it
close all anonymous fds periodically. Also, Madhu from IBM has a patch with
a config setting where NFS-Ganesha opens and closes temp/anonympus fds
without caching them at all. You may hit a perf hit for not cashing fds
based on your FSAL/fs implementation though.
On Mon, Dec 21, 2020 at 7:18 PM Daniel Gryniewicz <dang(a)redhat.com> wrote:
Okay, I understand the reasoning. This is inherently impossible
with
NFSv4, since the protocol specification itself requires that FDs remain
open as long as the client is using them. Similarly, it's impossible
with any kind of locking (either NFSv3 or NFSv4), since, on linux, you
must keep your FD open for the lock to continue to exist.
For straight, non-locking NFSv3, it's possible, but it's not currently
implemented. The FD closing threads in Ganesha are not designed to
close all anonymous FDs, but rather to keep the number of open anonymous
FDs low. Work could be done to close them all, but no code exists
currently.
Daniel
On 12/19/20 11:45 AM, gershon geva wrote:
> Hi Daniel,
>
> We run Ganesha on top of our proprietary filesystem WekaFS. Some of our
filesystem background cleanup tasks requires that all FDs on a given export
be closed. Our current NFS implementation closes all open anonymous FDs
after a pre-configured time period and allow those tasks to run when the
NFS activity is relatively idle. We wish to have more or less the same
behavior with Ganesha.
> _______________________________________________
> Support mailing list -- support(a)lists.nfs-ganesha.org
> To unsubscribe send an email to support-leave(a)lists.nfs-ganesha.org
>
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7:14 a.m.
Is will try, but there's no guarantee, as FDs on entries that are ref'd
will be skipped. So, ongoing traffic can mean that there's never one
time when all FDs are guaranteed to be closed. In addition, it's
non-deterministic, so the FS would need some way to detect that all FDs
are closed, you couldn't just trigger it.
Daniel
On 12/22/20 12:38 AM, Malahal Naineni wrote:
I thought setting the low percentage (FD_LWMark_Percent) to zero
makes
it close all anonymous fds periodically. Also, Madhu from IBM has a
patch with a config setting where NFS-Ganesha opens and closes
temp/anonympus fds without caching them at all. You may hit a perf hit
for not cashing fds based on your FSAL/fs implementation though.
On Mon, Dec 21, 2020 at 7:18 PM Daniel Gryniewicz <dang(a)redhat.com
<mailto:dang@redhat.com>> wrote:
Okay, I understand the reasoning. This is inherently impossible with
NFSv4, since the protocol specification itself requires that FDs remain
open as long as the client is using them. Similarly, it's impossible
with any kind of locking (either NFSv3 or NFSv4), since, on linux, you
must keep your FD open for the lock to continue to exist.
For straight, non-locking NFSv3, it's possible, but it's not currently
implemented. The FD closing threads in Ganesha are not designed to
close all anonymous FDs, but rather to keep the number of open
anonymous
FDs low. Work could be done to close them all, but no code exists
currently.
Daniel
On 12/19/20 11:45 AM, gershon geva wrote:
> Hi Daniel,
>
> We run Ganesha on top of our proprietary filesystem WekaFS. Some
of our filesystem background cleanup tasks requires that all FDs on
a given export be closed. Our current NFS implementation closes all
open anonymous FDs after a pre-configured time period and allow
those tasks to run when the NFS activity is relatively idle. We wish
to have more or less the same behavior with Ganesha.
> _______________________________________________
> Support mailing list -- support(a)lists.nfs-ganesha.org
<mailto:support@lists.nfs-ganesha.org>
> To unsubscribe send an email to
support-leave(a)lists.nfs-ganesha.org
<mailto:support-leave@lists.nfs-ganesha.org>
>
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11 comments
6 participants
participants (6)
-
Daniel Gryniewicz -
Frank Filz -
gershon geva -
Malahal Naineni -
Satish Chandra Kilaru -
Yoni K