RE: async vs. sync

["Roger Heflin" <rheflin@atipa.com>]

Solaris has always been sync on the export, async on the mount, that
is unless you had a prestoserve type module (which made some kernel
adjustments) which used to be available on the servers, and would backup
the memory that nfs was using as cache with a battery.  Without
said hardware there was no way to make Solaris async.

                               Roger=20

> -----Original Message-----
> From: nfs-admin@lists.sourceforge.net=20
> [mailto:nfs-admin@lists.sourceforge.net] On Behalf Of jehan.procaccia
> Sent: Monday, November 22, 2004 12:58 PM
> To: Trond Myklebust
> Cc: Olaf Kirch; nfs@lists.sourceforge.net; mci-unix@int-evry.fr
> Subject: Re: [NFS] async vs. sync
>=20
> Trond Myklebust wrote:
>=20
> >m=E5 den 22.11.2004 Klokka 18:55 (+0100) skreiv jehan.procaccia:
> >
> > =20
> >
> >>My users won't accept the sync performances !
> >>   =20
> >>
> >
> >Will they accept data loss in case of a server crash? If they don't=20
> >care, then hey - you're safe...
> > =20
> >
> in my old solaris 7 nfs it was async I suppose ! although we=20
> didn't lose data, maybe we where risking it ... ? anyway now=20
> I move from and old solaris NFS server to a brand new linux=20
> one with a SAN (AX100) Storage Processor in Raid 5 an Fiber=20
> Channel attachement, how can I support performances more than=20
> 50 times longer :-( with that config,  user and manager wil=20
> tell me that I  spoild money on that new server !, there must=20
> be a misconfiguration somewhere ?.
>=20
> >BTW: I've never seen a slowdown as bad as that. Just out of=20
> curiosity,=20
> >what happens if you turn off ACL support and/or use a client from=20
> >ftp.kernel.org, with no ACL support.
> > =20
> >
> I did it on the server export option (no_acl) , no better=20
> performance.=20
> However I don't know why I have ACLs,  I nerver ask for it !?
> /etc/fstab on the server
> /dev/emcpowerp1         /p2v5f1         ext3   =20
> defaults,usrquota,grpquota     1 2
>=20
> >(NOTE: the reason I've rejected ACLs so far in the mainline=20
> client is=20
> >the lack of support for caching in the patches I've seen so far)
> >
> >Cheers,
> >  Trond
> > =20
> >
>=20
>=20
>=20
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