Part C: Simulate Drive Failures

Important: To prevent having to build array parity multiple times, ensure that you gather all the information once your array is completed $($fully synchronized$)$ before you follow the steps below to simulate disk failure.

Mark one of the drives in your array as failed. For example:

mdadm $--$manage $/$ dev$/$md$0--$set$-$faulty

HERE$\frac{?}{d}>e\frac{v}{D}$RIVE NAME HERE$>$

Check the details $of$ the array using the mdadm utility. For example:

mdadm $--$detail $\frac{?}{de}\frac{v}{m}d0$ SCREEN CAP $4$

Note: You can also check the array status using the command: # $ca\frac{t}{p}ro\frac{c}{m}$dstat.

Mark another $of$ the drives $in$ your array $as$ failed.

Check the details about the array using the mdadm utility. SCREEN CAP $5$

Part $D$: Remove and Examine the Failed Drives

Remove the failed drives from the array and check the details $of$ the array. For example:

mdadm $\frac{?}{de}\frac{v}{m}d0-r\frac{?}{de}\frac{v}{?}$

Examine the failed drives using the mdadm command with the $--$misc $--$examine option. For example:

mdadm $--$misc $--$examin$\frac{e}{d}e\frac{v}{H}$ERE$>$ SCREEN CAP $6$

Overwrite the superblock of the failed drive with zeros. When you add the drive back in$,$ ensure that it doesn't have any old superblock information. For example:

mdadm $--$misc $--$zero$-$superblock $/$ dev$/$