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Article #810Re: relative performance of rz23 and rz55 disks
From: Alan's Home for Wayward Notes Fi...
Date: Fri, 20 Oct 1989 18:23
Date: Fri, 20 Oct 1989 18:23
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In article <12001@watcgl.waterloo.edu>, idallen@watcgl.waterloo.edu writes: > From: "Ian! D. Allen [CGL]" <idallen> > > On an 8-Meg VAXstation 3100 running Ultrix 3.0 I created a 10Meg file and > then did: > > # time dd if=in of=out bs=1024k > > The rz23 took about a minute of real time. The rz55 consistently > took 10-15 seconds longer. > Why? As shipped the RZ23 has a read-ahead cache which is enabled. The RZ55 also has a read-ahead cache, but it isn't enabled. Hopefully a future version of rzdisk(8) will support turning on the read-ahead cache of the RZ55. Till then, I don't how or even if it can be done. -- Alan Rollow alan@nabeth.enet.dec.com
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Path: arc1-ca.pugleaf.net!utzoo!utgpu!jarvis.csri.toronto.edu!rutgers!apple!sun-barr!decwrl!shlump.nac.dec.com!shodha.dec.com!alan From: alan@shodha.dec.com ( Alan's Home for Wayward Notes File.) Newsgroups: comp.sys.dec Subject: Re: relative performance of rz23 and rz55 disks Summary: Why the RZ23 is faster than an RZ55. Message-ID: <454@shodha.dec.com> Date: 20 Oct 89 18:23:29 GMT References: <12001@watcgl.waterloo.edu> Distribution: comp Organization: Digital Equipment Corp. - Colorado Springs, CO. Lines: 22