how to create a degraded raid1 with only 1 of 2 drives ??
Hi mdadm raid gurus, I wanted to make a raid1 array, but at the moment I have only 1 drive available. The other disk is in the mail. I wanted to make a raid1 that i will use as a backup. But I need to do the backup now, before the second drive comes. So I did this. formated /dev/sda creating /dev/sda1 with type fd. then I tried to run mdadm -C /dev/md0 --level=1 --raid-devices=1 /dev/sda1 but I got an error message mdadm: 1 is an unusual numner of drives for an array so it is probably a mistake. If you really mean it you will need to specify --force before setting the number of drives so then i tried mdadm -C /dev/md0 --level=1 --force --raid-devices=1 /dev/sda1 mdadm: /dev/sda1 is too small:0K mdadm: create aborted now what does that mean? fdisk -l /dev/sda shows device boot start end blocks Id System /dev/sda1 1 60801 488384001 fdlinux raid autodetect so what do I do? I need to back up my data. If I simply format /dev/sda1 as an ext3 file system then I can't add the second drive later on. How can I set it up as a `degraded` raid1 array so I can later on add in the second drive and sync? Thanks for your help! Mitchell - To unsubscribe from this list: send the line unsubscribe linux-raid in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html
Re: how to create a degraded raid1 with only 1 of 2 drives ??
Quoting Mitchell Laks [EMAIL PROTECTED]: Hi mdadm raid gurus, I wanted to make a raid1 array, but at the moment I have only 1 drive available. The other disk is in the mail. I wanted to make a raid1 that i will use as a backup. But I need to do the backup now, before the second drive comes. So I did this. formated /dev/sda creating /dev/sda1 with type fd. then I tried to run mdadm -C /dev/md0 --level=1 --raid-devices=1 /dev/sda1 Perhaps give this a try: # mdadm -C /dev/md0 --level=1 --raid-devices=2 /dev/sda1 missing Cheers, Mike - To unsubscribe from this list: send the line unsubscribe linux-raid in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html
Re: how to create a degraded raid1 with only 1 of 2 drives ??
I think my error was that maybe I did not do write the fdisk changes to the drive with fdisk w so I did fdisk /dev/sda p then w and then when I did mdadm -C /dev/md0 --level=2 -n2 /dev/sda1 missing it worked and set up the array. Thanks for being there! Mitchell - To unsubscribe from this list: send the line unsubscribe linux-raid in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html
Re: how to create a degraded raid1 with only 1 of 2 drives ??
Mitchell Laks wrote: I think my error was that maybe I did not do write the fdisk changes to the drive with fdisk w No - your problem was that you needed to use the literal word missing like you did this time: mdadm -C /dev/md0 --level=2 -n2 /dev/sda1 missing [however, this time you also asked for a RAID2 (--level=2) which I doubt would work] David - To unsubscribe from this list: send the line unsubscribe linux-raid in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html
Re: how to create a degraded raid1 with only 1 of 2 drives ??
Mitchell Laks wrote: Hi mdadm raid gurus, I wanted to make a raid1 array, but at the moment I have only 1 drive available. The other disk is in the mail. I wanted to make a raid1 that i will use as a backup. But I need to do the backup now, before the second drive comes. So I did this. formated /dev/sda creating /dev/sda1 with type fd. then I tried to run mdadm -C /dev/md0 --level=1 --raid-devices=1 /dev/sda1 but I got an error message mdadm: 1 is an unusual numner of drives for an array so it is probably a mistake. If you really mean it you will need to specify --force before setting the number of drives so then i tried mdadm -C /dev/md0 --level=1 --force --raid-devices=1 /dev/sda1 mdadm: /dev/sda1 is too small:0K mdadm: create aborted now what does that mean? fdisk -l /dev/sda shows device boot start end blocks Id System /dev/sda1 1 60801 488384001 fdlinux raid autodetect so what do I do? I need to back up my data. If I simply format /dev/sda1 as an ext3 file system then I can't add the second drive later on. How can I set it up as a `degraded` raid1 array so I can later on add in the second drive and sync? Specify two drives and one as missing. -- Bill Davidsen [EMAIL PROTECTED] Woe unto the statesman who makes war without a reason that will still be valid when the war is over... Otto von Bismark - To unsubscribe from this list: send the line unsubscribe linux-raid in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html
