FreeNAS Claiming out of Space

[DougATClark]

Specs:

11.1-U4
Supermicro chassis / board / powersupply
E3-1230 v2
32gb ECC
3TB Western Digital x 16
IT mode flashed controller

Single Volume, with a single dataset on it, lz4 compression no dedup, single zvol on that dataset with no dedup. I have this presented to a windows server via iSCSI. Windows can see the full dataset size of 28.9TB. I only have 15.8TB of data on the volume according to windows, with 13.1TB free. FreeNAS webui is claiming its 90% used. I checked through the webui for snapshots and do not see any. Ran a scrub of the volume yesterday and did not see much difference, though it took about 24 hours.

I'm looking for suggestions on how to either reclaim the space so freenas stops alerting me or find where the extra space is used. Anyone have pointers?

 

[m0nkey_]

Please provide the output of zfs list and zfs list -t snapshot.

 

[DougATClark]

Code:

root@SYSTEMNAME:~ # zfs list
NAME														   USED  AVAIL  REFER  MOUNTPOINT
VeeamVolume												   29.2T   748G   188K  /mnt/VeeamVolume
VeeamVolume/.system											114M   748G   205K  legacy
VeeamVolume/.system/configs-a7c4a4a3d45a4720a1e6b8ad799731fd  38.3M   748G  38.3M  legacy
VeeamVolume/.system/cores									  802K   748G   802K  legacy
VeeamVolume/.system/rrd-a7c4a4a3d45a4720a1e6b8ad799731fd	  73.2M   748G  73.2M  legacy
VeeamVolume/.system/samba4									 410K   748G   410K  legacy
VeeamVolume/.system/syslog-a7c4a4a3d45a4720a1e6b8ad799731fd   1.22M   748G  1.22M  legacy
VeeamVolume/veeamzvol										 29.2T  1.83T  28.1T  -
freenas-boot												  3.98G  24.8G	64K  none
freenas-boot/ROOT											 3.96G  24.8G	29K  none
freenas-boot/ROOT/11.1-RELEASE								 254K  24.8G   825M  /
freenas-boot/ROOT/11.1-U1									  388K  24.8G   826M  /
freenas-boot/ROOT/11.1-U2									  375K  24.8G   833M  /
freenas-boot/ROOT/11.1-U4									 3.96G  24.8G   836M  /
freenas-boot/ROOT/Initial-Install								1K  24.8G   727M  legacy
freenas-boot/ROOT/default									  152K  24.8G   727M  legacy
freenas-boot/grub											 6.84M  24.8G  6.84M  legacy

root@SYSTEMNAME:~ # zfs list -t snapshot
NAME											USED  AVAIL  REFER  MOUNTPOINT
freenas-boot/ROOT/11.1-U4@2017-12-13-16:06:11  7.62M	  -   727M  -
freenas-boot/ROOT/11.1-U4@2017-12-28-07:21:09  7.80M	  -   727M  -
freenas-boot/ROOT/11.1-U4@2018-02-09-14:14:31   825M	  -   825M  -
freenas-boot/ROOT/11.1-U4@2018-03-12-07:17:57   825M	  -   826M  -
freenas-boot/ROOT/11.1-U4@2018-05-23-11:38:06   832M	  -   833M  -

 

[m0nkey_]

FreeNAS webui is claiming its 90% used.

That's because it is.

VeeamVolume/veeamzvol 29.2T 1.83T 28.1T -

With ZFS, you should not be using more than 80% capacity of your pool.

 

[DougATClark]

That I understand (and i'm trying to get back under that threshold), though according to windows I am 55%. I guess what I'm trying to understand is the disconnect between windows show 13 of 29TB free and freenas showing 90% used.

 

[m0nkey_]

That I understand (and i'm trying to get back under that threshold), though according to windows I am 55%. I guess what I'm trying to understand is the disconnect between windows show 13 of 29TB free and freenas showing 90% used.

Because you have a 30TB zvol. ZFS considers that all used, although Windows iSCSI sees available space. FreeNAS doesn't know what's in the zvol, only that it exists.

 

[DougATClark]

Is there a way to non-disruptively change that? Or is there a better way to configure this so that freenas is aware of how much space is being used?

 

[Stux]

You could recreate the zvol as a sparse zvol. Then unused space internal to the zvol won’t be pre-allocated on the pool.

I’m not sure if you get ‘recycled’ space back tho...

 

[danb35]

With ZFS, you should not be using more than 80% capacity of your pool.

...and with primarily block storage, not more than 50%.

Or is there a better way to configure this so that freenas is aware of how much space is being used?

Is there a reason you need to be using iSCSI? File sharing with SMB would avoid this problem.

 

[DougATClark]

No particular reason. I've inherited two of these systems and they have always been iSCSI letting windows do the file system end of it. Are there any reliability or speed considerations with native SMB with freenas and 10gb?

 

[danb35]

Are there any reliability or speed considerations with native SMB with freenas and 10gb?

Not that I'm aware of.

 

[DougATClark]

Okay. I may have to test that option out. It sounds like this is going to be a disruptive change. Move everything elsewhere, re-configure and move back?

 

[Stux]

Okay. I may have to test that option out. It sounds like this is going to be a disruptive change. Move everything elsewhere, re-configure and move back?

This presumed that whatever you’re doing doesn’t mind being on a network volume instead if a “local” drive. The good (and bad) thing about iSCSI is that it looks like a local disk to the operating system.