Date: Thu, 21 Nov 2002 14:13:08 +0200 (EET) From: "BigBrother (BigB3)" <bigbrother@bonbon.net> To: freebsd-questions@freebsd.org Subject: Performance degration of moving FFS hdd from a slow to a fast pc. Message-ID: <20021121140035.E29240-100000@bigb3server.bbcluster.gr>
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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 I have a question about FFS filesystem. According to a paper about the design of UFS filesystem[1], if you create the FFS filesystem on a slow cpu and then move it to a fast cpu with a fast controller, theh the FFS wont perform efficient. This is justified because when the UFS is created having in mind the speed of the system, in order to create the cyllinder group summary information with optimal rotationally blocks [see page 7 of the paper]. If somebody takes the hdd of the slow pc and put it on a much faster pc, then it is reported that the throughput will drop significantly because of lost disk revolutions. I would like to know if this is true. Can I move my hdd of my old slow pc [intel 486] to a pentium III 600Mhz machine without performance penatly, or its better to re-create the filesystem? Thank you very much... References: [1] http://citeseer.nj.nec.com/mckusick84fast.html - --- We are being monitored..but there is a solution... Use PGP for signing and encrypting emails!!!! Download my public key at http://www.us.pgp.net -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.2.0 (FreeBSD) iD8DBQE93M3XGe/V3CxAyHoRAtCKAJsFEPJAEgYOzE8NkszHO5jUBETrnwCfTC+V vLYTHw2fXGYPIwfuzA3TitM= =/4V2 -----END PGP SIGNATURE----- To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-questions" in the body of the message
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