From mboxrd@z Thu Jan 1 00:00:00 1970 From: Asdo Subject: Re: possible bus loading problem during resync Date: Tue, 09 Mar 2010 12:00:17 +0100 Message-ID: <4B962A41.50207@shiftmail.org> References: <4B95EB5E.5090702@vorgon.com> <73e903671003090230y135d104cte15e07604b85b8aa@mail.gmail.com> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: QUOTED-PRINTABLE Return-path: In-reply-to: <73e903671003090230y135d104cte15e07604b85b8aa@mail.gmail.com> Sender: linux-raid-owner@vger.kernel.org To: =?ISO-8859-1?Q?Kristleifur_Da=F0ason?= , "Timothy D. Lenz" Cc: linux-raid List-Id: linux-raid.ids Kristleifur Da=F0ason wrote: > On Tue, Mar 9, 2010 at 6:31 AM, Timothy D. Lenz wr= ote: > =20 >> I'm working on 2 systems that are mainly for running vdr. I've had t= hese >> running somewhat for awhile with raid. But a couple nights ago as I = was >> quitting for the night, I noticed one of the computers drive light s= taying >> on. I had just made some changes to xine and didn't know if somethin= g had >> crashed. Turned on the TV and found the video was freezing for 10-20= secs >> every 10-20secs. Logging in using putty and winscp I found it very s= luggish >> to respond.Starting top I found it was doing the regular array check= /resync....... >> -- >> =20 > > > Sorry about the incredibly brief answer: Not to dismiss other issues, > but that behavior seems like exactly what I've seen when a disk has > been failing. > =20 If that is true, how does that happen, the driver is hung? But anyway,=20 how can such things happen when there is more than one CPU-core? try disabling NCQ by echo 1 > /sys/block/sdX/device/queue_depth for all= =20 drives. After doing this, at most 1 request can be issued to one drive=20 until the drive has serviced such request. After doing this, firstly I'd say the sluggishness should disappear, at= =20 least on SSH when not touching the disks. And then you can look with=20 "iostat -x 1": probably the bad drive will have a service time (svctm)=20 or await much worse than the others. Just guesses, correct me if I'm wrong -- 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