<html><body><p><font size="2">Hi<br></font><font size="2"><br></font><font size="2">From phone so typos are expected. <br></font><font size="2"><br></font><font size="2">You maybe would like to look into remo mounts and export the FS only as ro to the client cluster. <br></font><font size="2"><br></font><font size="2">--<br></font><font size="2">Cheers<br></font><font size="2"><br></font><font size="2">> On 4. Mar 2020, at 12.05, Agostino Funel <agostino.funel@enea.it> wrote:<br></font><font size="2">> <br></font><font size="2">> Hi,<br></font><font size="2">> <br></font><font size="2">> we have a GPFS cluster version 4.2.3.19. We have seen in the official <br></font><font size="2">> "Administration and Programming Reference" (version 4 Release 2.0, pag. <br></font><font size="2">> 28) that the read-only mount option (-o ro) is not explicitly cited. <br></font><font size="2">> This option is supported in version 5.*.<br></font><font size="2">> <br></font><font size="2">> However we tried, as a test, the -o ro mount option on two clients with <br></font><font size="2">> the following SO and kernels<br></font><font size="2">> <br></font><font size="2">> client 1<br></font><font size="2">> <br></font><font size="2">> CentOS Linux release 7.3.1611 (Core)<br></font><font size="2">> uname -r<br></font><font size="2">> 3.10.0-514.26.2.el7.x86_64<br></font><font size="2">> <br></font><font size="2">> <br></font><font size="2">> client 2<br></font><font size="2">> <br></font><font size="2">> CentOS release 6.4 (Final)<br></font><font size="2">> uname -r<br></font><font size="2">> 2.6.32-358.23.2.el6.x86_64<br></font><font size="2">> <br></font><font size="2">> and it worked fine.<br></font><font size="2">> <br></font><font size="2">> The -o ro option is non permanent in the sense that unmounting and <br></font><font size="2">> remounting the file system on these clients it turned in r/w original state.<br></font><font size="2">> <br></font><font size="2">> Now, we have the necessity of setting read-only the file system on all <br></font><font size="2">> clients of our cluster.<br></font><font size="2">> <br></font><font size="2">> The question is: could we safely use the -o ro option for all clients <br></font><font size="2">> even if this option is not cited in the official (v. 4 release 2.0) <br></font><font size="2">> documentation?<br></font><font size="2">> <br></font><font size="2">> Thank you very much.<br></font><font size="2">> <br></font><font size="2">> Best regards,<br></font><font size="2">> <br></font><font size="2">> Agostino Funel<br></font><font size="2">> <br></font><font size="2">> <br></font><font size="2">> <br></font><font size="2">> <br></font><font size="2">> -- <br></font><font size="2">> Agostino Funel<br></font><font size="2">> DTE-ICT-HPC<br></font><font size="2">> ENEA<br></font><font size="2">> P.le E. Fermi 1<br></font><font size="2">> 80055 Portici (Napoli) Italy<br></font><font size="2">> Phone: (+39) 081-7723575<br></font><font size="2">> Fax: (+39) 081-7723344<br></font><font size="2">> E-mail: agostino.funel@enea.it<br></font><font size="2">> WWW: <a href="http://www.afs.enea.it/funel">http://www.afs.enea.it/funel</a> <br></font><font size="2">> <br></font><font size="2">> <br></font><font size="2">> <br></font><font size="2">> ==================================================<br></font><font size="2">> <br></font><font size="2">> Questo messaggio e i suoi allegati sono indirizzati esclusivamente alle persone indicate e la casella di posta elettronica da cui e' stata inviata e' da qualificarsi quale strumento aziendale.<br></font><font size="2">> La diffusione, copia o qualsiasi altra azione derivante dalla conoscenza di queste informazioni sono rigorosamente vietate (art. 616 c.p, D.Lgs. n. 196/2003 s.m.i. e GDPR Regolamento - UE 2016/679).<br></font><font size="2">> Qualora abbiate ricevuto questo documento per errore siete cortesemente pregati di darne immediata comunicazione al mittente e di provvedere alla sua distruzione. 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