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Operating Systems Linux SuSE openSuse 11.1 RAID 0 Question Post 302344817 by mark54g on Monday 17th of August 2009 04:41:01 PM
Old 08-17-2009
No, it does not change anything. If you had RAID 0 you would have no way to recover save for backing everything up and starting over, or adding 2 more drives and becoming a RAID 0+1 set.

If you mark a drive as failed you will lose it as part of the array. If you lose the other drive, then you will lose the machine, as if you had only a single drive load set.

There will be a small overhead shift, as you will no longer incur the write penalty for RAID 1, but will also no longer get the read performance increase that RAID 1 provides.

What you are doing is this:
1) logically "failing" a drive, to stop the sync to the mirror
2) removing the formerly mirrored drive from the array to re-purpose.

You should do an mdadm --zero-superblock to the drive you have removed (AND ONLY to that drive). Then you should also fdisk it and change the partition types to the appropriate types, in case it was set as RAID. From there you can proceed to using the drive as any other drive.

I would strongly advise you make a system backup JUST in case, as any disk re-purposing can go wrong.
 

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array-info(1)															     array-info(1)

NAME
array-info - check the status of a HP (Compaq) SmartArray controller SYNOPSIS
array-info -d array_device_path [-a|-l|-A|-c|-s|-L|-h] DESCRIPTION
Array-info is a command line tool to retrieve informations and logical drives status from several RAID controllers (currently HP Compaq IDA and CISS and MD). It displays informations about the firmware version, Rom revision, number of physical and logical drives on the con- troller, aswell as the fault tolerance, size, number of physical disks and status for each logical drive. OPTIONS
--device | -d Path to array device, e.g. /dev/ida/c0d0 or /dev/cciss/c0d1 --all-drives | -a Show informations about all drives --logical drive | -l Show informations about selected logical drive --show-ctrl | -c Show informations about controller --show-logical | -L Show informations about logical drives --show-physical | -p Show physical device informations --show-status | -s Show status of logical drives --show-all | -A Show all informations --version | -V Show version -h Show help about options COPYRIGHT
This manual page was written by Raphael Pinson <<raphink@ubuntu.com>>. Permission is granted to copy, distribute and/or modify this docu- ment under the terms of the GNU General Public License, Version 2 or any later version published by the Free Software Foundation. 2006-12-15 array-info(1)

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