Setting up "JBOD"

[Terror Factor]

Hi all,

I want to use all disks in my Lacie as a single volume. JBOD is mentioned a few times, but I can't find any guide for it.
I don't need redundancy, but I want to use all available space on my NAS. It should show up as 1 big single volume, instead of 3 smaller volumes.

If this is possible: how? :)

Thank you!

-again, great project, this Lacie has had a serious upgrade with this firmware!-

[Jocko]

Hi,

I think you confuse RAID0 and JBOD

JBOD is not a raid and the main difference is that if you have a disk failure on a jbod member you do not lose your data from the other disks whereas with a raid0 you lose all data !

JBOD is mentioned a few times, but I can't find any guide for it.

Indeed but it is the raid0 support and not JBOD feature. On the next firmware version, there is only a full support for single volume; raid0-raid1 and raid5 volume. This version should be released in few weeks...

To implement JBOD support we need to add some additional tools (as LVM) to be able to build a single logical volume. A feature we need to deepen for another version.

So currently with the firmware, you can have either 5 physical single data volume or a raid0

[Terror Factor]

Thank you again, Jocko!
I didn't confuse them, but I thought it was already possible in the current firmware.
Is there a guide for raid 0 somewhere? I found the guides for 1 and 5, but not for 0. Might use that in the meantime.

[Jocko]

No there is not a raid 0 tutorial.

So use the raid5 tutorial and on the create mdadm command declares 0 as level instead of 5.
Note: I assume you do not have yet data on disks, no need to build the raid in two steps ;)

I deepen more JBOD support with linux.
Use JBOD instead of a linear raid or a raid 0 is for its disk faulty capacity: you lost only data on the faulty disk.
But with our platform where there is no raid controler, we must use a software solution like LVM.
Then the issue is LVM builds a logical device to do it.

So if we have a disk failure, you got the same result as a raid 0: you lose all data :pound
=> for 5big2, we can not get a real JBOD device but only a fake one like raid 0 or linear (which is also abusively called JBOD)

I did not plan to add support for raid linear but if you have different disk sizes, it is better to use this raid type instead of raid 0
As currently I am writing the related menu to create a raid volume, there is no issue to add this raid type.

So in next version, the firmware will support linear, raid0, raid1, raid5 volume

[Terror Factor]

Great, thanks!

Being able to use different disk sizes might still be an advantage. Too bad it doesn't make a difference for losing data compared to raid 0.

I went with 5 for now :)