Exporting the filesystem to the remove cluster as RO is an excellent
idea and works if all remote clients only need RO.
Alternatively (and I believe this is still the case) you can set the
"ro" filesystem mount option in the file
"/var/mmfs/etc/localMountOptions" or
"/var/mmfs/etc/localMountOptions.<YOURFSNAME>" on all nodes.
The issue with changing /etc/fstab is that in my experience GPFS has
been known to override it.
-- Lauz
On 04/03/2020 11:24, Jan-Frode Myklebust wrote:
I don’t know the answer — but as an alternative solution, have you
considered splitting the read only clients out into a separate
cluster. Then you could enforce the read-only setting using «mmauth
grant ... -a ro».
That should be supported.
-jf
ons. 4. mar. 2020 kl. 12:05 skrev Agostino Funel
<[email protected] <mailto:[email protected]>>:
Hi,
we have a GPFS cluster version 4.2.3.19. We have seen in the official
"Administration and Programming Reference" (version 4 Release 2.0,
pag.
28) that the read-only mount option (-o ro) is not explicitly cited.
This option is supported in version 5.*.
However we tried, as a test, the -o ro mount option on two clients
with
the following SO and kernels
client 1
CentOS Linux release 7.3.1611 (Core)
uname -r
3.10.0-514.26.2.el7.x86_64
client 2
CentOS release 6.4 (Final)
uname -r
2.6.32-358.23.2.el6.x86_64
and it worked fine.
The -o ro option is non permanent in the sense that unmounting and
remounting the file system on these clients it turned in r/w
original state.
Now, we have the necessity of setting read-only the file system on
all
clients of our cluster.
The question is: could we safely use the -o ro option for all clients
even if this option is not cited in the official (v. 4 release 2.0)
documentation?
Thank you very much.
Best regards,
Agostino Funel
--
Agostino Funel
DTE-ICT-HPC
ENEA
P.le E. Fermi 1
80055 Portici (Napoli) Italy
Phone: (+39) 081-7723575
Fax: (+39) 081-7723344
E-mail: [email protected] <mailto:[email protected]>
WWW: http://www.afs.enea.it/funel
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