Date: Thu, 14 Dec 2000 19:33:05 +0000 From: Tony Finch <dot@dotat.at> To: Dag-Erling Smorgrav <des@ofug.org> Cc: Gustavo Vieira Goncalves Coelho Rios <gustavo@ifour.com.br>, hackers@FreeBSD.ORG Subject: Re: very big mail spool directory Message-ID: <20001214193305.D92196@hand.dotat.at> In-Reply-To: <xzpbsufz1g7.fsf@flood.ping.uio.no> References: <3A368F8C.1918684F@ifour.com.br> <xzpsnns4jvx.fsf@flood.ping.uio.no> <20001213214404.P71002@hand.dotat.at> <xzpbsufz1g7.fsf@flood.ping.uio.no>
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Dag-Erling Smorgrav <des@ofug.org> wrote: >Tony Finch <dot@dotat.at> writes: >> Why a prime number? All you need is an even spread, and given that >> user IDs are usually allocated sequentially any modulus will do. > >Because a prime number is less likely to cause an imbalance in where >files are actually stored on disk - just like you want an odd (and >preferably prime) stripe size on RAIDs to (amongst other reasons) >avoid having all the superblock backups end up on the same disk. That's another situation in which the collision rate is very low. I still think any number of about the right size will do. Tony. -- f.a.n.finch fanf@covalent.net dot@dotat.at " ``Well, let's go down and find out who's grave it is.'' ``How?'' ``By going down and finding out!'' " To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message
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