deleting mdadm array?
Hello, I just created a new array /dev/md1 like this: mdadm --create --verbose /dev/md1 --chunk=64 --level=raid5 \ --metadata=1.1 --bitmap=internal \ --raid-devices=3 /dev/hdc2 /dev/sda2 missing But later I changed my mind, and I wanted to use chunk 128. Do I need to delete this array somehow first, or can I just create an array again (overwriting the current one)? -- Janek Kozicki | - 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: deleting mdadm array?
On Thursday October 25, [EMAIL PROTECTED] wrote: Hello, I just created a new array /dev/md1 like this: mdadm --create --verbose /dev/md1 --chunk=64 --level=raid5 \ --metadata=1.1 --bitmap=internal \ --raid-devices=3 /dev/hdc2 /dev/sda2 missing But later I changed my mind, and I wanted to use chunk 128. Do I need to delete this array somehow first, or can I just create an array again (overwriting the current one)? Just recreate with new values, overwriting the current one. NeilBrown - 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: deleting mdadm array?
Janek Kozicki wrote: Hello, I just created a new array /dev/md1 like this: mdadm --create --verbose /dev/md1 --chunk=64 --level=raid5 \ --metadata=1.1 --bitmap=internal \ --raid-devices=3 /dev/hdc2 /dev/sda2 missing But later I changed my mind, and I wanted to use chunk 128. Do I need to delete this array somehow first, or can I just create an array again (overwriting the current one)? How much later? This will, of course, destroy any data on the array (!) and you'll need to mkfs again... To answer the question though: just run mdadm again to create a new array with new parameters. I think the only time you need to 'delete' an array before creating a new one is if you change the superblock version since it quietly writes different superblocks to different disk locations you may end up with 2 superblocks on the disk and then you get confusion :) (I'm not sure if mdadm is clever about this though...) Also, if you don't mind me asking: why did you choose version 1.1 for the metadata/superblock version? 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: deleting mdadm array?
On Thursday October 25, [EMAIL PROTECTED] wrote: I think the only time you need to 'delete' an array before creating a new one is if you change the superblock version since it quietly writes different superblocks to different disk locations you may end up with 2 superblocks on the disk and then you get confusion :) (I'm not sure if mdadm is clever about this though...) Mdadm tries to be clever. When creating an array, it zeros any superblocks that it finds on the array in any of the expected locations. And when guessing the metadata format used, if it find two or more, it chooses the one with the more recent create timestamp. NeilBrown - 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
