But it tried to resync after i have added the disc again with raidhotadd. :( But it could do nothing. in the log file there have bon hundreds of entires like. May 20 23:52:25 utgard kernel: md: syncing RAID array md0 May 20 23:52:25 utgard kernel: md: minimum _guaranteed_ reconstruction speed: 1000 KB/sec/disc. May 20 23:52:25 utgard kernel: md: using maximum available idle IO bandwith (but not more than 200000 KB/sec) for reconstruction. May 20 23:52:25 utgard kernel: md: using 128k window, over a total of 156288256 blocks. May 20 23:52:25 utgard kernel: md: md0: sync done. But how you can se this lastet only for 1 second or something like that. How would this work? comment out the entries in the /etc/raidtab, boot the system set 1 device as faulty ( best would be the one that faild the day before) and than just mkraid /dev/md0 ? Dominik > 2mkraid or mdadm will work, just be very sure you use the correct options. > As long as the system does not attempt a re-sync, the data will not be > destroyed. But if you get the parameters wrong and a re-sync starts, > expect > data to be lost. So, keep 1 disk missing until you are sure you have it > right! > > One of the parameters that must be correct: "parity-algorithm". > > If you used mkraid your /etc/raidtab file should have what you need. You > will need to use the "failed-disk" keyword. See "man raidtab". I am not > sure how to use it. So be careful! > > Guy > > -----Original Message----- > From: Dominik Sennfelder [mailto:Sennfelder@xxxxxx] > Sent: Friday, May 21, 2004 4:59 PM > To: Guy > Cc: linux-raid@xxxxxxxxxxxxxxx > Subject: RE: Raid Failed What to to > > Hello > > Thanks for your help. > I created the array with mkraid /dev/md0 after i added the entrys in > /etc/raidtab. > I analyzed the logs an saw that one disk failed one day before, > so the raid run with 3 discs. My fault was to raidsetfault the wrong > drive. > But in that moment the Raid broke up an no write was possilble because it > got remountet -ro. After i hotadded it again, it tried to sync but with > only > two discs syncing wouldn't be possible. The drive i removed wan't really > faulty, it was just set faulty. I even could browse the filesystem when > just > 2 discs run. > So can i reassamble the drive mith mdadm? or do i have to use mkraid? > > Thanks for your help and suggestions. > > Dominik > > > > This is an example for using mdadm where the second of three disks is > bad. > > But you must use the same chunk size and other RAID5 parameters or the > > array > > will have bogus data. It would be nice if you still have the original > > command you used to create the array. > > > > mdadm -C /dev/md0 -l 5 -n 3 /dev/hda3 missing /dev/hdc3 > > > > Guy > > > > -----Original Message----- > > From: Guy [mailto:bugzilla@xxxxxxxxxxxxxxxx] > > Sent: Friday, May 21, 2004 10:00 AM > > To: 'Clemens Schwaighofer'; 'Dominik Sennfelder' > > Cc: 'linux-raid@xxxxxxxxxxxxxxx' > > Subject: RE: Raid Failed What to to > > > > If you re-make the array with the same parameters as it has now the data > > will not be lost (assuming it is still there now). If 1 disk is really > > bad > > then leave it out. > > > > The procedures depend on which program you use to create the array. Do > > you > > use mkraid or mdadm? > > > > Guy > > > > -----Original Message----- > > From: linux-raid-owner@xxxxxxxxxxxxxxx > > [mailto:linux-raid-owner@xxxxxxxxxxxxxxx] On Behalf Of Clemens > > Schwaighofer > > Sent: Friday, May 21, 2004 4:45 AM > > To: Dominik Sennfelder > > Cc: linux-raid@xxxxxxxxxxxxxxx > > Subject: Re: Raid Failed What to to > > > > -----BEGIN PGP SIGNED MESSAGE----- > > Hash: SHA1 > > > > Dominik Sennfelder wrote: > > | Hello > > | > > | I have got a Raid 5 with 4 160 GB Disk, > > | On of the Disks Failed because. But I know its OK I had this for some > > | times. > > | A Restart solved The Problem. > > | But now Tried to raidhotremove the Drive and removed the wrong drive. > > | I just recongized the Problem after i raidhotadded itagain. > > | No the Raid tries to sync again. > > > > well if you removed two drives from your Raid5 array, it might got > > competly out of sync and then there is no way to recover. I have never > > tried this with my raid, but if you add another disk it well be > > re-synced, ergo it tries to rebuild the array out of the CRCs on the > > other drives, if you remove two, you don't have enough redudant data to > > do this (raid 6 can recover from a 2 drive failure). > > > > I hope you have a backup. > > > > - -- > > Clemens Schwaighofer - IT Engineer & System Administration > > ========================================================== > > TEQUILA\Japan, 6-17-2 Ginza Chuo-ku, Tokyo 104-8167, JAPAN > > Tel: +81-(0)3-3545-7703 Fax: +81-(0)3-3545-7343 > > http://www.tequila.co.jp > > ========================================================== > > -----BEGIN PGP SIGNATURE----- > > Version: GnuPG v1.2.4 (GNU/Linux) > > > > iD8DBQFArcGmjBz/yQjBxz8RAkYKAJ9TAc03OnmIth/M03xBmopKerZLOQCcCiiG > > wk/lAjdcrd1jPWSoLyOGLAE= > > =5uyj > > -----END PGP SIGNATURE----- > > - > > To unsubscribe from this list: send the line "unsubscribe linux-raid" in > > the body of a message to majordomo@xxxxxxxxxxxxxxx > > More majordomo info at http://vger.kernel.org/majordomo-info.html > > > > > > -- > Mfg Dominik Sennfelder > -------------- > Sennfelder@xxxxxx IRC: #spooky > ICQ: 18164192 Blue Skies > > > - > To unsubscribe from this list: send the line "unsubscribe linux-raid" in > the body of a message to majordomo@xxxxxxxxxxxxxxx > More majordomo info at http://vger.kernel.org/majordomo-info.html > -- cYa Bul|wýf -------------- Buliwyf@xxxxxx IRC: #spooky ICQ: 18164192 Blue Skies - To unsubscribe from this list: send the line "unsubscribe linux-raid" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
