Date: Sat, 26 Nov 2005 20:41:52 +0100 From: Herve Boulouis <amon@sockar.homeip.net> To: user <user@dhp.com> Cc: freebsd-scsi@freebsd.org Subject: Re: configuration choices with Dell CERC (adaptec 2610SA) Message-ID: <20051126194152.GA594@ra.aabs> In-Reply-To: <Pine.LNX.4.21.0511261411190.8180-100000@shell.dhp.com> References: <Pine.LNX.4.21.0511261411190.8180-100000@shell.dhp.com>
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Le 26/11/2005 14:17, user a écrit: > > Read caching: yes/no (default is yes) > > (read caching does not rely on a battery, and is completely "safe", > right? I am going to set this to "yes", however I wonder - why would > anyone _ever_ set it to "no" ?) You usually want to disable read caching on all aac based adaptec raid controllers because it decreases performance. > Write caching: enable/disable > > (this is the one that can get you into trouble if the system loses power > before a write is committed to disk, and the battery is dead, right? I am > going to set this to "disable" because I do not think the 2610SA has a > battery ... right ?) If your server is plugged on a UPS you can safely enable it, it's quite a performance gain. > Rebuild rate: high/medium/low > > (I have no idea what this means - I never saw this in adaptec bios before > ... can anyone define exactly what this means ?) This controls how much ressources the card will put in rebuilding a volume that got a failed disk. A high rebuild rate will mean a short rebuild time but slower disk accesses during the rebuild. -- Herve Boulouis
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