Date: Thu, 03 Nov 2005 13:48:29 -0500 From: Chuck Swiger <cswiger@mac.com> To: Francisco <francisco@natserv.net> Cc: stable@freebsd.org Subject: Re: Disk 100% busy Message-ID: <436A5B7D.6090408@mac.com> In-Reply-To: <20051103133248.Y60367@zoraida.natserv.net> References: <0E972CEE334BFE4291CD07E056C76ED807738005@bragi.housing.ufl.edu> <p06200716bf78aa876114@[10.0.1.210]> <20051103133248.Y60367@zoraida.natserv.net>
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Francisco wrote: > On Mon, 17 Oct 2005, Brad Knowles wrote: >> Note that RAID-1 is the second worst-case for mail server >> performance -- it accelerates reads (if you have mirror >> load-balancing), but all writes are required to be held until complete >> on both disks. The only worse case would be RAID-5, where you have to >> write (or re-write) an entire RAID block at once, plus the parity >> information. > > Coming late into the thread... > What is a good raid level for a maildir IMAP server? RAID 10 (or 0+1 as > others call it). If you're using maildir, that is one of the situations which works pretty well with RAID-5, although RAID-10 is also (always? :-) a good choice. -- -Chuck
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