I have a 6-drive RAID6 of WD15EADS (512-byte sector) drives. One of the
drives is failing, and I have been forced to buy a WD15EARS (4096-byte
sector) drive to replace the failing drive, and it has the new "advanced
Do I need to set the "XP" jumper on pins 7-8 to play nicely with the
other 512-byte sector drives in my array, or will mdraid be okay with
the 4096-byte sector drive? Will there be a performance penalty adding
the drive to my array?
Did you create your RAID on the device or on a partition? If its on
the entire device then you should be fine, tho this might depend on
which metadata format you are using & where its located on the disc
(not sure how the metadata effects data alignment). If you used a
standard partitioning tool its likely your partitions start on sector
63. This can be confirmed via an fdisk -l on your other drives. If
that's the case then you'll probably want to use the offest jumper.
How the drive will behave with the others I have no idea. If after
you add the drive and your write speeds drop dramatically then
something is misaligned.