From mboxrd@z Thu Jan 1 00:00:00 1970 From: "Bodo Thiesen" Subject: RAID5, 2 out of 4 disks failed, Events value differs too much Date: Tue, 05 Dec 2006 09:48:02 +0100 Message-ID: <20061205084802.16720@gmx.net> Mime-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 Content-Transfer-Encoding: QUOTED-PRINTABLE Return-path: Sender: linux-raid-owner@vger.kernel.org To: linux-raid@vger.kernel.org List-Id: linux-raid.ids Hi, I have a little problem: Some hours ago the second of four disks were kicked out of my RAID5 thu= s rendering it unusable. As of my current knowledge, the disks are stil= l working correctly (I assume a cable connection problem) but that's no= t the problem. The real problem is, that the first failed disk has an e= vent value of 9102893, the second failed disk has a value of 9324862 an= d the other two disks have a value of 9324869. In this case, what is th= e best to do to recover the RAID? Because just recreating the array wit= h the 9324862-disk and the two 9324869-disks and later hotadding the 91= 02893-disk, is just unclean and as I understood it, this would trigger = some silent data failures. Is there a chance to prevent this data failu= res to happen at all, or is it at least possible to tell, where this er= ror(s) are (so I can manually check the data and take appropriate steps= )? Remember that I still have the data from the first failed disk, from= which parts may still be relatively up to date. Has anyone had this problem already and found a nice solution for this? Regards in advance, Bodo mdadm -E on all affected disks: --> please bite here <---> please bite here <---> please bite here <-- /dev/mapper/sda: Magic : a92b4efc Version : 00.90.03 UUID : 876ed759:74a31656:94332345:a976171b Creation Time : Thu Feb 2 05:30:53 2006 Raid Level : raid5 Device Size : 244198464 (232.89 GiB 250.06 GB) Array Size : 732595392 (698.66 GiB 750.18 GB) Raid Devices : 4 Total Devices : 4 Preferred Minor : 0 Update Time : Wed Nov 29 03:12:12 2006 State : clean Active Devices : 4 Working Devices : 4 Failed Devices : 0 Spare Devices : 0 Checksum : 7bd96cb9 - correct Events : 0.9102893 Layout : left-symmetric Chunk Size : 32K Number Major Minor RaidDevice State this 1 253 0 1 active sync /dev/mapper/sda 0 0 253 2 0 active sync /dev/mapper/sdc 1 1 253 0 1 active sync /dev/mapper/sda 2 2 253 1 2 active sync /dev/mapper/sdb 3 3 253 3 3 active sync /dev/mapper/sdd /dev/mapper/sdb: Magic : a92b4efc Version : 00.90.03 UUID : 876ed759:74a31656:94332345:a976171b Creation Time : Thu Feb 2 05:30:53 2006 Raid Level : raid5 Device Size : 244198464 (232.89 GiB 250.06 GB) Array Size : 732595392 (698.66 GiB 750.18 GB) Raid Devices : 4 Total Devices : 4 Preferred Minor : 0 Update Time : Tue Dec 5 04:31:06 2006 State : clean Active Devices : 3 Working Devices : 3 Failed Devices : 2 Spare Devices : 0 Checksum : 7be82e68 - correct Events : 0.9324862 Layout : left-symmetric Chunk Size : 32K Number Major Minor RaidDevice State this 2 253 1 2 active sync /dev/mapper/sdb 0 0 253 2 0 active sync /dev/mapper/sdc 1 1 0 0 1 faulty removed 2 2 253 1 2 active sync /dev/mapper/sdb 3 3 253 3 3 active sync /dev/mapper/sdd /dev/mapper/sdc: Magic : a92b4efc Version : 00.90.03 UUID : 876ed759:74a31656:94332345:a976171b Creation Time : Thu Feb 2 05:30:53 2006 Raid Level : raid5 Device Size : 244198464 (232.89 GiB 250.06 GB) Array Size : 732595392 (698.66 GiB 750.18 GB) Raid Devices : 4 Total Devices : 4 Preferred Minor : 0 Update Time : Tue Dec 5 04:45:20 2006 State : clean Active Devices : 2 Working Devices : 2 Failed Devices : 4 Spare Devices : 0 Checksum : 7be831d7 - correct Events : 0.9324869 Layout : left-symmetric Chunk Size : 32K Number Major Minor RaidDevice State this 0 253 2 0 active sync /dev/mapper/sdc 0 0 253 2 0 active sync /dev/mapper/sdc 1 1 0 0 1 faulty removed 2 2 0 0 2 faulty removed 3 3 253 3 3 active sync /dev/mapper/sdd /dev/mapper/sdd: Magic : a92b4efc Version : 00.90.03 UUID : 876ed759:74a31656:94332345:a976171b Creation Time : Thu Feb 2 05:30:53 2006 Raid Level : raid5 Device Size : 244198464 (232.89 GiB 250.06 GB) Array Size : 732595392 (698.66 GiB 750.18 GB) Raid Devices : 4 Total Devices : 4 Preferred Minor : 0 Update Time : Tue Dec 5 04:45:20 2006 State : clean Active Devices : 2 Working Devices : 2 Failed Devices : 4 Spare Devices : 0 Checksum : 7be831de - correct Events : 0.9324869 Layout : left-symmetric Chunk Size : 32K Number Major Minor RaidDevice State this 3 253 3 3 active sync /dev/mapper/sdd 0 0 253 2 0 active sync /dev/mapper/sdc 1 1 0 0 1 faulty removed 2 2 0 0 2 faulty removed 3 3 253 3 3 active sync /dev/mapper/sdd --> please bite here <---> please bite here <---> please bite here <-- --=20 "Ein Herz f=FCr Kinder" - Ihre Spende hilft! Aktion: www.deutschlandseg= elt.de Unser Dankesch=F6n: Ihr Name auf dem Segel der 1. deutschen America's C= up-Yacht! - 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