Space reserved LUN offline, out of space

nicholas4704 — Wed, 04 Jun 2025 22:52:24 GMT

Hi all

Please help to understand why space reserved LUN in space reserved volume went offline. ONTAP cDOT 8.3RC1

Volume Hyper_V_boot 200Gb, guarantee volume. (it was increased by autogrow later, you'll see output with increased values)

No snapshots.

Two LUNs created in that volume 80Gb each. 80Gb+80Gb=160Gb used, in theory. Now I see 55Gb reserved in a volume.

Host - Windows 2012 Hyper-V two node cluster.

One of LUNs went offline while copying VM from other storage to this LUN.

I can't understand why it went offline. This is unaccepatbale with resrvations ON.

Maybe it was related to ODX and it tried to create a sis clone??? Please help.

Thank you

Nick

This message was after out of spce condition:

wafl.vol.full: Insufficient space on volume Hyper_V_boot@vserver:724a384d-7c80-11e5-9774-00a0983050f0 to perform operation. 68.0KB was requested but only 1.00KB was available.

wafl.sis.clone.create.failed: File clone create of fileid 101 in volume Hyper_V_boot failed with error 28 backpressure 0.

See more info below:

df -r -h

Filesystem total used avail reserved Mounted on
/vol/Hyper_V_boot/ 241GB 216GB 25GB 55GB ---
/vol/Hyper_V_boot/.snapshot 0B 0B 0B 0B ---

snap list returns nothing - no snapshots

deduplication was not run for a while:

Vserver Name: svm-Hyper-V
Volume Name: Hyper_V_boot
Volume Path: /vol/Hyper_V_boot
State: Enabled
Status: Idle
Progress: Idle for 216:11:57
Type: Regular
Schedule: -
Efficiency Policy Name: default
Blocks Skipped Sharing: 0
Last Operation State: Success
Last Success Operation Begin: Tue Oct 27 10:15:15 2015
Last Success Operation End: Tue Oct 27 10:15:15 2015
Last Operation Begin: Tue Oct 27 10:15:15 2015
Last Operation End: Tue Oct 27 10:15:15 2015
Last Operation Size: 0B
Last Operation Error: -
Changelog Usage: 51%
Logical Data Size: 57.39GB
Logical Data Limit: 640TB
Logical Data Percent: 0%
Queued Job: -
Stale Fingerprint Percentage: 0
Compression: false
Inline Compression: false
Incompressible Data Detection: false
Constituent Volume: false
Compression Quick Check File Size: 524288000

lun1 details:

Vserver Name: svm-Hyper-V
LUN Path: /vol/Hyper_V_boot/Clara
Volume Name: Hyper_V_boot
Qtree Name: ""
LUN Name: Clara
LUN Size: 80.00GB
OS Type: windows_2008
Space Reservation: enabled
Serial Number: REPvS$HBGX1T
Comment:
Space Reservations Honored: true
Space Allocation: disabled
State: online
LUN UUID: ba2f7f8d-4f64-47af-adb5-7b4a9311eb08
Mapped: mapped
Block Size: 512
Device Legacy ID: -
Device Binary ID: -
Device Text ID: -
Read Only: false
Fenced Due to Restore: false
Used Size: 36.86GB
Maximum Resize Size: 1004GB
Creation Time: 10/27/2015 10:04:50
Class: regular
Node Hosting the LUN: node-01
QoS Policy Group: -
Clone: false
Clone Autodelete Enabled: false
Inconsistent import: false

lun2 details

Vserver Name: svm-Hyper-V
LUN Path: /vol/Hyper_V_boot/Roza
Volume Name: Hyper_V_boot
Qtree Name: ""
LUN Name: Roza
LUN Size: 80.00GB
OS Type: windows_2008
Space Reservation: enabled
Serial Number: REPvS$HBGX1U
Comment:
Space Reservations Honored: true
Space Allocation: disabled
State: online
LUN UUID: 7f0a19e4-8e9b-4c89-9fc4-61bf03361c82
Mapped: mapped
Block Size: 512
Device Legacy ID: -
Device Binary ID: -
Device Text ID: -
Read Only: false
Fenced Due to Restore: false
Used Size: 18.69GB
Maximum Resize Size: 1004GB
Creation Time: 10/27/2015 10:13:35
Class: regular
Node Hosting the LUN: node-01
QoS Policy Group: -
Clone: false
Clone Autodelete Enabled: false
Inconsistent import: false

Volume details:

Vserver Name: svm-Hyper-V
Volume Name: Hyper_V_boot
Aggregate Name: aggr01
Volume Size: 241.2GB
Volume Data Set ID: 1029
Volume Master Data Set ID: 2147484677
Volume State: online
Volume Type: RW
Volume Style: flex
Is Cluster-Mode Volume: true
Is Constituent Volume: false
Export Policy: default
User ID: 0
Group ID: 0
Security Style: unix
UNIX Permissions: ---rwxr-xr-x
Junction Path: -
Junction Path Source: -
Junction Active: -
Junction Parent Volume: -
Comment:
Available Size: 25.01GB
Filesystem Size: 241.2GB
Total User-Visible Size: 241.2GB
Used Size: 216.2GB
Used Percentage: 89%
Volume Nearly Full Threshold Percent: 95%
Volume Full Threshold Percent: 98%
Maximum Autosize (for flexvols only): 500GB
(DEPRECATED)-Autosize Increment (for flexvols only): 4.12GB
Minimum Autosize: 82.47GB
Autosize Grow Threshold Percentage: 90%
Autosize Shrink Threshold Percentage: 50%
Autosize Mode: grow
Autosize Enabled (for flexvols only): true
Total Files (for user-visible data): 7509599
Files Used (for user-visible data): 108
Space Guarantee Style: volume
Space Guarantee in Effect: true
Snapshot Directory Access Enabled: true
Space Reserved for Snapshot Copies: 0%
Snapshot Reserve Used: 0%
Snapshot Policy: none
Creation Time: Tue Oct 27 10:04:48 2015
Language: C.UTF-8
Clone Volume: false
Node name: node-01
NVFAIL Option: on
Volume's NVFAIL State: false
Force NVFAIL on MetroCluster Switchover: off
Is File System Size Fixed: false
Extent Option: off
Reserved Space for Overwrites: 55.55GB

Fractional Reserve: 100%
Primary Space Management Strategy: volume_grow
Read Reallocation Option: off
Inconsistency in the File System: false
Is Volume Quiesced (On-Disk): false
Is Volume Quiesced (In-Memory): false
Volume Contains Shared or Compressed Data&colon; true
Space Saved by Storage Efficiency: 1.81GB
Percentage Saved by Storage Efficiency: 1%
Space Saved by Deduplication: 1.81GB
Percentage Saved by Deduplication: 1%
Space Shared by Deduplication: 413.1MB
Space Saved by Compression: 0B
Percentage Space Saved by Compression: 0%
Volume Size Used by Snapshot Copies: 0B
Block Type: 64-bit
Is Volume Moving: false
Flash Pool Caching Eligibility: read-write
Flash Pool Write Caching Ineligibility Reason: -
Managed By Storage Service: -
Create Namespace Mirror Constituents For SnapDiff Use: -
Constituent Volume Role: -
QoS Policy Group Name: -
Caching Policy Name: -
Is Volume Move in Cutover Phase: false
Number of Snapshot Copies in the Volume: 0
VBN_BAD may be present in the active filesystem: false
Is Volume on a hybrid aggregate: false
Total Physical Used Size: 55.58GB
Physical Used Percentage: 23%

Re: Space reserved LUN offline, out of space

RPHELANIN — Thu, 05 Nov 2015 10:29:45 GMT

could be fractional reserve as i see Volume is set to 100% fractional reserve

http://community.netapp.com/t5/Data-ONTAP-Discussions/Fractional-reserve-in-Volume/td-p/44783

Re: Space reserved LUN offline, out of space

nicholas4704 — Thu, 05 Nov 2015 10:44:18 GMT

I did check how Fractional Reserve works in 7-mode: it reserves space (reserved space size equals size of real data written to LUN), when you create a snapshot. Snapshot creation fails if there is not enough space, if I remeber right.

This guarantees that all overwrites will go to reserved space in case volume runs out of space. And it prevents creating new snapshots if there is no space in volume.

In my case there are no user snapshots. I wanted to guarantee that LUN never goes offline by switching off Thin Provisioning.

Nick

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Space reserved LUN offline, out of space

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