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Forum Discussion
ReadyNas 2312 resync after shutdown and automatically uses 90% storage space
The device ReadyNas 2312 was working perfectly for months until we had numerious of unexpected shutdown. Before the cunexpected shutdown we have only use up to 50% of the storage space (12 X 10TB) an...
Are you using thin or thick provisioning, and what size LUN are you creating? It souds as if you are creating a thick provisioned LUN that takes most of the available space.
I'm using thick which equals 83TB. I'm using 81TB thick provision.
- 12 x10TB with RAID 6 configuration.
- LUN disappears and the iSCSi connection fails
OK, so you are creating an iSCSI LUN that uses 90% of the drive space and are wondering why 90% gets used up? That doesn't leave the NAS much overhead, witch is the likely reason for the connection issue.
I can only guess that you previously used thin provisioning, which will grow as used, not thick, which immediately uses up the allocated space.
- This is the fourth set of drives I'm changing and I definitely know that I used thick LUN provision. Even in the scene where we use up %90 of storage space, is it supposed to cancel every connection to access files because I have never seen a device denying file access when full.
The drives are clearly not the issue. Have you tried leaving the NAS more headroom -- creating a smaller LUN? You certainly need to try comething different. Doing the same thing over and over is going to get you the same result over and over. If it didn't. even when you don't like that result, I'd be more worried.
BTRFS does require headroom. How much when the space is taken up by an essentially empty iSCSI LUN, I have no idea. Is it "supposed" to deny access? Well, I'm sure it's not a designed-in feature. But it certainly could be a limitation. Your log shows you are receiving a warning that you are apparently ignoring.
Assuming you have upgraded the NAS OS at some point since first put in service, there may be something about the newer version that requires more headroom when the LUN is created.
I still don't understand why you are "surprised" that 90% of the storage is being used up when you are performing an operation that is designed to do just that. A thick-provisioned LUN reserves the full amount of allocated space when it is created, so it is "used up" from the OS's point of view. If that was not previously the case, then you are doing something different now than before, and my guesses are the LUN size or thin vs. thick provisioning. If the OS was previously showing only 50% use when you had a similarly sized LUN, then it was not thick provisioned. And based on your experience with the thick provisioned one, a thin provisioned one might run into a similar issue if you were to let it become full, so keeping it smaller is likely a good idea.
Sandshark wrote:
I still don't understand why you are "surprised" that 90% of the storage is being used up when you are performing an operation that is designed to do just that.
The 12x10TB RAID-6 array overall should have 100 TB of storage - ~90.95 TiB. A thick LUN of 83 TiB should end up using 91% of the capacity. So I agree that part is expected.
Also, that it makes sense to try this with a smaller LUN. Of course if the 83 TiB size is needed, then the volume would need to be expanded (perhaps adding some 14 TB or 16 TB drives into the mix).
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