From mboxrd@z Thu Jan 1 00:00:00 1970 From: Jon Hardcastle Subject: RE: linux disk access when idle Date: Fri, 21 Aug 2009 01:17:23 -0700 (PDT) Message-ID: <371021.65217.qm@web51309.mail.re2.yahoo.com> References: <3ECBDC05781B3D48ABD520A01ABF2F9B2E9A6F9E25@SE-EX008.groupinfra.com> Reply-To: Jon@eHardcastle.com Mime-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 Content-Transfer-Encoding: QUOTED-PRINTABLE Return-path: In-Reply-To: <3ECBDC05781B3D48ABD520A01ABF2F9B2E9A6F9E25@SE-EX008.groupinfra.com> Sender: linux-raid-owner@vger.kernel.org To: Matt Garman , linux-raid , AndrewHenry List-Id: linux-raid.ids --- On Fri, 21/8/09, Henry, Andrew wrote: > From: Henry, Andrew > Subject: RE: linux disk access when idle > To: "Matt Garman" , "linux-raid" > Date: Friday, 21 August, 2009, 7:42 AM > I had a similar issue, as I wanted to > take full advantage of parking heads but they kept coming > alive again.=A0 I was putting them to sleep with hdparm. >=20 > I gave up at the end, but thought I had read that it was > likely syslog or other internals that were polling the disc > too frequently.=A0 Sorry Im a bit vague on the details. >=20 > If this was the case (I didn't really investigate) then I > thought, stuff it, because I wanted syslog to keep doing > it's thing. >=20 > --andrew >=20 > -- > To unsubscribe from this list: send the line "unsubscribe > linux-raid" in > the body of a message to majordomo@vger.kernel.org > More majordomo info at=A0 http://vger.kernel.org/majordomo-info.html >=20 I did this with the data drives in my array - never managed it with the= system drives though. You need to tell smartd to not poll if the drives are asleep and also t= ell syslog not to poll too often.=20 There is some for of flag you can apply to see write requests and the a= pplication that is doing them.......? BUT a curious problem I have - and have NEVER really solved is that whe= n a drive is asleep if a scheduled smart check runs - the drive doesn't= wake up quickly enough so smart brands the drive as 'incapable of a sm= art test' and sends me a warning email.... every single time... ----------------------- N: Jon Hardcastle E: Jon@eHardcastle.com 'Do not worry about tomorrow, for tomorrow will bring worries of its ow= n.' ----------------------- =20 -- To unsubscribe from this list: send the line "unsubscribe linux-raid" i= n the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html