HP MSR Encryption Accelerators - Manual (Page 25)

Software installation 25
RAID 1
Create a mirrored set by using the fioa and fiob IO Accelerators:
$ mdadm --create /dev/md0 --level=1 --raid-devices=2 /dev/fioa /dev/fiob
To view your specific names, use the fio-status command.
RAID 10
Create a striped, mirrored array by using four IO Accelerators (fioa, fiob, fioc, and fiod):
$ mdadm --create /dev/md0 -v --chunk=256 --level=raid10 --raiddevices=4
/dev/fioa /dev/fiob /dev/fioc /dev/fiod
View the results:
fio-status
Building a RAID 10 across multiple devices
In a RAID 10 configuration, sets of two disks are mirrored, and then those mirrors are striped. When setting
up a RAID 10 configuration across multiple IO Accelerator Duos, HP recommends that you make sure that no
mirror resides solely on the two IO Accelerator modules that comprise an IO Accelerator Duo.
To lay the data out:
1. Use the --layout=n2 option when creating the RAID 10 configuration. This is the default.
2. Ensure that no two IO Accelerator modules from the same duo are listed side-by-side.
The following sample code illustrates HP recommended configurations.
CAUTION: You must list the fiox devices in the correct sequence.
IMPORTANT: When the IO Accelerator devices have been formatted with the fio-format
utility, use the following commands.
# 2 Duos RAID10
$ mdadm --create --assume-clean --level=raid10 --layout=n2 -n 4 /dev/md0 \
/dev/fioa /dev/fioc \
/dev/fiob /dev/fiod
# Mirror groups are: fioa,fioc and fiob,fiod
# 3 Duos RAID10
$ mdadm --create --assume-clean --level=raid10 --layout=n2 -n 6 /dev/md0 \
/dev/fioa /dev/fiod \
/dev/fioc /dev/fiof \
/dev/fioe /dev/fiob
# 4 Duos RAID10
$ mdadm --create --assume-clean --level=raid10 --layout=n2 -n 8 /dev/md0 \
/dev/fioa /dev/fiod \