From:	CRDGW2::CRDGW2::MRGATE::"SMTP::CRVAX.SRI.COM::RELAY-INFO-VAX"  6-OCT-1989 15:12
To:	MRGATE::"ARISIA::EVERHART"
Subj:	Pagefile fragmentation

Received: From UCBVAX.BERKELEY.EDU by GIZMO.SRI.COM with TCP; Fri,  6 OCT 89 11:06:43 PDT
Received: by ucbvax.Berkeley.EDU (5.61/1.37)
	id AA29504; Fri, 6 Oct 89 11:02:29 -0700
Received: from USENET by ucbvax.Berkeley.EDU with netnews
	for info-vax@kl.sri.com (info-vax@kl.sri.com)
	(contact usenet@ucbvax.Berkeley.EDU if you have questions)
Date: 6 Oct 89 15:16:35 GMT
From: uflorida!novavax!ray@gatech.edu  (Ray Wagner)
Organization: Nova University, Fort Lauderdale, FL
Subject: Pagefile fragmentation
Message-Id: <1517@novavax.UUCP>
Sender: info-vax-request@kl.sri.com
To: info-vax@kl.sri.com


	There has been some talk about various causes of pagefile
fragmentation, but so far no one has brought up the known bug in
5.0- 5.1 Modified Page Writer. VMS 5 flushes the modified pagefile
much more often than VMS 4.x which in turn causes many more small
writes to the pagefile. According to Allen Watson in DIGITAL REVIEW
Sept.4, 1989 this can badly fragment the file in only a few hours
after booting. In the next issue he suggest a fix which restores
VMS V4 MPW behavior. Set MPW_IOLIMIT to one and MPW_LOWAITLIM to
MPW_LOLIM. I wouldn't advise doing this kind of thing without
reading both articles first. And then studying your system symptoms
to be sure that changing these parameters would help rather than
hurt your system.
Ray