How the XRE200 supports RAID 1 mirroring
Sometimes an RFI/RFP requests an official document or a proof for the RAID type of XRE200. Unlike QFabric Director, there is no boot menu to show the RAID setup. There is also no official document which explicitly says XRE200 supports RAID 1.
Because the XRE200 has a single chip RAID processor, Sil5723 from Silicon Image, XRE200 does not have a separate configuration menu which other RAID cards have.
Although the Sil5723 processor supports JBOD and RAID 0 and 1, XRE200 only supports RAID 1.
According to Silicon Image website – http://www.siliconimage.com/solutions/ip/raid/, RAID 0 striping is called “FAST” mode and RAID 1 mirroring is called “SAFE” mode.
In Junos OS 12.1, a new command was introduced to verify HDD status:
root> request chassis routing-engine hard-disk-test
RAID device path: /dev/ad4
Firmware Version: 11597
RAID controller s/n: 12345678
RAID Chip ID: 127
RAID policy: SAFE <-- Here
Drive0 model: WDC WD1600AAJS-00YZCA0
Drive1 model: WDC WD1600AAJS-00YZCA0
Drive0 s/n: WD-WMAYUX558219
Drive1 s/n: WD-WMAYUX593068
Drive0 capacity: 149(GB)
Drive1 capacity: 149(GB)
Number of partitions: 1
Size of Partitions:
Partition 0: 149(GB)
RAID Status: Healthy
* From the output of the command, “RAID policy: SAFE” means RAID 1 mirroring.
Please refer to the following link for the detail of this command:
request chassis routing-engine hard-disk-test