From mboxrd@z Thu Jan 1 00:00:00 1970 From: =?UTF-8?B?U2VyZ2l1c3ogQnJ6ZXppxYRza2k=?= Subject: Re: mdadm --monitor: need extra feature? Date: Wed, 22 Aug 2012 12:57:57 +0200 Message-ID: <5034BB35.2090102@supersystem.pl> References: <503365EB.6000006@supersystem.pl> <503366A1.9030307@hesbynett.no> <50337654.9000905@supersystem.pl> <50338185.4020003@websitemanagers.com.au> <503486C7.70503@supersystem.pl> <20120822174435.685d80d4@notabene.brown> <5034AB59.90907@supersystem.pl> <5034B0A2.4080403@websitemanagers.com.au> <5034B993.3070000@supersystem.pl> Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: QUOTED-PRINTABLE Return-path: In-Reply-To: <5034B993.3070000@supersystem.pl> Sender: linux-raid-owner@vger.kernel.org To: Adam Goryachev Cc: linux-raid@vger.kernel.org List-Id: linux-raid.ids W dniu 22.08.2012 12:50, Sergiusz Brzezi=C5=84ski pisze: > W dniu 22.08.2012 12:12, Adam Goryachev pisze: >> On 22/08/12 19:50, Sergiusz Brzezi=C5=84ski wrote: >>> 3. In Ubuntu there is in /lib/udev/rules.d/64-md-raid.rules file >>> responsible for this. I only changed one line: >>> >>> ACTION=3D=3D"add", RUN+=3D"/sbin/mdadm --incremental $tempnode" >>> to: >>> ACTION=3D=3D"add", RUN+=3D"/sbin/mdadm --incremental --run $tempnod= e" >>> >>> And thats all! >>> >>> Now, I don't have to use my script from crontab anymore. Raid start >>> rebuilding array immediately after disk is inserted. >> Could this cause a problem (ie, what is the reason this is not the >> default value)? >> >> My guess is it may cause md to start an array where all "available" >> disks are not yet added to the array. ie, if you are plugging in thr= ee >> drives, it might run the array after plugging in the second array, a= nd >> then when you plugin the third drive it will need to do a resync. > > > > I suppose worst case is a resync where it wasn't really needed. > > > > Regards, > > Adam > > I made a try. > > 1. > I never had before 3 drives at one time. After inserting the third dr= ive for the > first time (the drive had a raid partition with proper UUID) it happe= ned > nothing. (or maybye something happened but I don't know what because = i turned > off the debugging :( ) > > 2. > Than I made mdadm /dev/md0 -a /dev/third_drive > It was added as a spare. > > 3. > I removed and inserted again the third drive. Again nothing. No info = in log, and > it was not added as a spare. > > I don't know if it is good or wrong behawior (maybye the drive should= appear > automaticaly as a spare?) but for me it is not a problem because I do= n't use > spares :) CORRECTION: IT WAS AUTOMATICALY ADDED AS A SPARE So I think it works as expected! I did the test fast - I did probably a mistake checking that. Sergiusz -- 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