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- Path: sparky!uunet!stanford.edu!agate!usenet.ins.cwru.edu!gatech!swrinde!network.ucsd.edu!mvb.saic.com!macro32
- From: olin@cheme.tn.cornell.edu (Steve Thompson, Cheme System Mangler)
- Newsgroups: vmsnet.internals
- Subject: Re: VMS tuning for a vaxcluster (LAVC)
- Message-ID: <0095FEB2.7B1E39E0.10606@cheme.tn.cornell.edu>
- Date: 31 Aug 92 16:36:45 GMT
- Organization: Macro32<==>Vmsnet.Internals Gateway
- Lines: 29
- X-Gateway-Source-Info: Mailing List
-
- joltes@husc10.harvard.edu writes:
-
- ><brydon@dsny25.sinet.slb.com> writes:
- >
- >[much useful stuff deleted]
- >
- >>Okay, but what about the situation of one satellite vaxstation on a lightly
- >>loaded network? I think page read I/O's should be considered separately from
- >>page write I/O's. Does this satellite system do page read I/O's any faster
- >>over the ethernet versus to local disk? [I would imagine that page write
- >>I/O's would be dependent entirely on the relative disk speeds of the local
- >>versus boot node disk speed.]
- >
- >Nope. The local disk's still faster. When I and a friend did VMS tuning
- >studies for <a former employer> we found that even on an unloaded net the
- >local disk was faster. Mind you, this was using VAXstation IIs with between
- >5 and 16MB and RD54s. Mileage on newer systems may vary, but I'd bet that
- >the local disk still beats Ethernet traffic.
- >
-
- Depends on your hardware. We have a VAX 4000 model 500 with RF35's serving a
- bunch of VS3100's, some with disks (RZ23) and some without. I can assure you
- that the local disk is not faster in this situation. I had a diskless 3100
- paging to the 4500 for a while; the machine is now at my house and has a local
- RZ57 as a standalone system. It most definitely *felt* faster when it was paging
- to the 4500; I have no measurements on this, however (except that an RF35 is
- waaaaay quicker than an RZ57).
-
- Steve
-