Describes how to perform the task of erasing the content from a disk
In a case where one disk in a RAID setup fails,the next step is replacing the failed disk with a blank disk.
If a customer has spare disk which is not blank, it can be erased by removing partition table.
There are multiple options to erase partitions. For the purpose of this article, we'll present one of them below.
# Warning: Make sure that correct disk is erased, otherwise data from the working one might be lost.
Disks are visible as following devices:
a) /dev/sda b) /dev/sdb
Below example assumes that the /dev/sda disk is being erased.
1). Using the fdisk tool, run the following commands on the CPM:
# unix su [root@X80-4 admin#] fdisk /dev/sda
The following information is displayed:
[root@X80-4 admin]# fdisk /dev/sda
The number of cylinders for this disk is set to 12161. There is nothing wrong with that, but this is larger than 1024, and could in certain setups cause problems with: 1) software that runs at boot time (e.g., old versions of LILO) 2) booting and partitioning software from other OSs (e.g., DOS FDISK, OS/2 FDISK)
Command (m for help):
2). Select p to print existing partitions.
A sample result is shown below (might be different on your system):
Disk /dev/sda: 100.0 GB, 100030242816 bytes 255 heads, 63 sectors/track, 12161 cylinders Units = cylinders of 16065 * 512 = 8225280 bytes
Device Boot Start End Blocks Id System /dev/sda1 * 1 13 104391 fd Linux raid autodetect /dev/sda2 14 12161 97578810 5 Extended /dev/sda5 14 138 1004031 fd Linux raid autodetect /dev/sda6 139 263 1004031 fd Linux raid autodetect /dev/sda7 264 1260 8008371 fd Linux raid autodetect /dev/sda8 1261 4746 28001263+ fd Linux raid autodetect /dev/sda9 4747 4759 104391 fd Linux raid autodetect /dev/sda10 4760 4884 1004031 fd Linux raid autodetect /dev/sda11 4885 5009 1004031 fd Linux raid autodetect /dev/sda12 5010 6006 8008371 fd Linux raid autodetect /dev/sda13 6007 9492 28001263+ fd Linux raid autodetect
3). Use the "d" command to delete partition.
Command (m for help): d Partition number (1-13): <number_taken_from sdaXX>
4). Repeat the command to delete the remaining partitions.
5). To verify that no partitions are visible on the disk, issue command "p" - print again. Disk /dev/sda: 100.0 GB, 100030242816 bytes 255 heads, 63 sectors/track, 12161 cylinders Units = cylinders of 16065 * 512 = 8225280 bytes
Device Boot Start End Blocks Id System
6). Use the "w" command to write changes to the disk.
7). Proceed with the RAID rebuilding procedure as described in the XOS Configuration Guide.
Imported Document ID: 000019086
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