Date: Mon, 19 Feb 1996 16:28:01 -0700 (MST) From: Terry Lambert <terry@lambert.org> To: ejon@tiac.net (Eric Jones) Cc: terry@lambert.org, questions@freebsd.org Subject: Re: NQNFS problems Message-ID: <199602192328.QAA13755@phaeton.artisoft.com> In-Reply-To: <199602192303.SAA01133@cola.tiac.net> from "Eric Jones" at Feb 19, 96 06:03:01 pm
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> >The leases are revoked on reference; not before. Local cache coherency > >is not maintained. > > I'm a little unclear on what you mean by "on reference" Do you mean on > a write attempt? It seems to me that if a process on the server machine > wants to write to a file which has leases against it, it ought to revoke > those leases immediately, or at least when a client attempts to read > additional data. If you attempt a server I/O, you will get a LEASE_CHECK -- it will blow the lease instance for the clients. If you attempt an operation by a client with a blown lease on the server side, then the client op will be failed. Server leasing isn't really trustworthy, IMO, since a client can't cause a lease reservtion to fail a server op. Server ops always work. > >What kind of clients are you using? > > > Pentium 133's with 64-128 MB of RAM (if you're wondering about the size > of buffer caches). We're setting up a new ISP with the biggest FBSD > cluster _I_'ve ever heard of. Unfortunately, we're having a VM problem/crisis > (another message on that will follow on the questions list) which may > monkeywrench the plans. I meant what OS. 8-). I'll assume it's FreeBSD. Suspect the client code (ie: disable leases on the client by leave the server leased). May or may not clear it up for you. 8-(. Terry Lambert terry@lambert.org --- Any opinions in this posting are my own and not those of my present or previous employers.
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