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Old 03-03-2016, 11:20 AM   #1
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Mobius H/W RAID5 constant disk light activity when mounted

Thanks in advance for any help you guys can provide.

Semi newby to Linux here. I have cranked up Ubuntu Server to share out media in the house and run Plex on it. So far I'm very happy... Ubuntu Server runs really lean. Mini pc setup... I3, 16G RAM, old drive for the OS.

I have a Mobius 5 bay external running RAID 5 that Linux see's fine as Mobius H/W RAID5. I formatted with no issues as ext4, partitioned gpt. All appears fine.

BUT... the disk lights on the enclosure constantly show activity when /dev/sdb1 is mounted. Is this normal and a result of the OS talking to hardware RAID? Should I be concerned?

Mobius support has no info... they've never tested their product with Linux Server (don't ask me why).

rlafauce@RockNAS:~$ product: Mobius H/W RAID5product: Mobius H/W RAID5
Welcome to Ubuntu 14.04.4 LTS (GNU/Linux 4.2.0-27-generic x86_64)

rlafauce@RockNAS:~$ sudo lshw -C disk
[sudo] password for rlafauce:
description: ATA Disk
product: TOSHIBA MK3265GS
vendor: Toshiba
physical id: 0.0.0
bus info: scsi@0:0.0.0
logical name: /dev/sda
version: 4E
serial: 12N3P7AQT
size: 298GiB (320GB)
capabilities: partitioned partitioned:dos
configuration: ansiversion=5 sectorsize=512 signature=000a5260
description: ATA Disk
product: Mobius H/W RAID5
physical id: 0.0.0
bus info: scsi@4:0.0.0
logical name: /dev/sdb
version: 0962
size: 16TiB (18TB)
capabilities: gpt-1.00 partitioned partitioned:gpt
configuration: ansiversion=5 guid=a59b4a02-7c51-45d7-a09a-2c58f0e701f6 sectorsize=512
rlafauce@RockNAS:~$ sudo mount -t ext4 /dev/sdb1 /media/sdb1

rlafauce@RockNAS:~$ df -h
Filesystem Size Used Avail Use% Mounted on
udev 7.7G 4.0K 7.7G 1% /dev
tmpfs 1.6G 1.4M 1.6G 1% /run
/dev/mapper/RockNAS--vg-root 278G 2.0G 262G 1% /
none 4.0K 0 4.0K 0% /sys/fs/cgroup
none 5.0M 0 5.0M 0% /run/lock
none 7.7G 4.0K 7.7G 1% /run/shm
none 100M 0 100M 0% /run/user
/dev/sda1 236M 39M 185M 18% /boot
/dev/sdb1 17T 20K 16T 1% /media/sdb1

Last edited by r_lafauce; 03-03-2016 at 11:25 AM.
Old 03-03-2016, 05:40 PM   #2
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The system doesn't care whether it is a regular disk or a hardware RAID logical unit.
To see if the system is doing any I/O, install iostat (apt-get sysstat) and run it:
iostat -d sdb1 1
Your distro may have code that is polling the device to see if any removable devices have been added or removed.


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