Date: Sat, 26 Nov 2005 15:34:23 -0500 (EST) From: user <user@dhp.com> To: Herve Boulouis <amon@sockar.homeip.net> Cc: freebsd-scsi@freebsd.org Subject: Re: configuration choices with Dell CERC (adaptec 2610SA) Message-ID: <Pine.LNX.4.21.0511261533290.8180-100000@shell.dhp.com> In-Reply-To: <20051126202812.GB594@ra.aabs>
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On Sat, 26 Nov 2005, Herve Boulouis wrote: > Le 26/11/2005 15:22, user a =E9crit: > >=20 > > One other clarification - I have the option to turn write caching on an= d > > off when I create the array (I am turning it ON now for the array based= on > > your opinion) ... but I also have an option in the adaptec bios to turn > > write-caching on for each specific disk drive. I have also turned this > > on. > > > > caching for the array _depend on_ having write caching for each drive > > turned on ?) >=20 > Never enable the disk write caching. The raid controller write caching > is safe if you have a battery on the card or a UPS whereas the disk write > cache can never be safe. Can you elaborate ? I am confused as to why the UPS does not protect the disk drives just as much as it protects the raid card ? thanks a lot for your help.
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