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Convert existing LL parition to RAID1


I am hoping to setup RAID1 using 2 disks.  This is a UEFI computer if that matters.

The exisiting drive "/dev/sda" is partitioned like this:

--- Code: ---Device     Boot   Start       End   Sectors   Size Id Type
/dev/sda1  *       2048   1050623   1048576   512M  b W95 FAT32
/dev/sda2       1052670 976771071 975718402 465.3G  5 Extended
/dev/sda5       1052672 976771071 975718400 465.3G 83 Linux

--- End code ---

Should the mirroring be done with "/dev/sda2" or "/dev/sda5"?

Also, since this is my active LL boot drive, can I convert it to RAID1 without having to format it?  I have the new "mirror" disk ready to be installed, but don't want to damage my LL boot drive.


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