This feels like it should be a very basic Storage Guy question that I should already know the answer to, but I'm not having a lot of luck so far.
A certain volume hit 93% usage, which threw an alert. By the time I looked at it, it was down to 90%, which is fine. It prompted me to look further into that volume though, and some numbers aren't adding up.
The volume hosts a handful of iSCSI LUNs. The percent-used value is still 90%. The percent-physical-used value is 20%. The volume show-space command shows 30% used (because of the +10% snapshot reserve). There's no snapshot spillover - I'm currently using less than half the reserve. What distinguishes one of the used percent values from another? How can I account for the difference?
Below is the output of the vol show -instance, and the vol show-space. Relevant items are highlighted. Thanks!
Vserver Name: [redacted]
Volume Name: [redacted]
Aggregate Name: [redacted]
Volume Size: 50TB
Volume Data Set ID: 1589
Volume Master Data Set ID: 2147485245
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: [redacted]
Available Size: 4.71TB
Filesystem Size: 50TB
Total User-Visible Size: 45TB
Used Size: 9.87TB
Used Percentage: 90%
Volume Nearly Full Threshold Percent: 95%
Volume Full Threshold Percent: 98%
Maximum Autosize (for flexvols only): 50TB
(DEPRECATED)-Autosize Increment (for flexvols only): 100GB
Minimum Autosize: 38.76TB
Autosize Grow Threshold Percentage: 92%
Autosize Shrink Threshold Percentage: 50%
Autosize Mode: grow
Autosize Enabled (for flexvols only): true
Total Files (for user-visible data): 31876689
Files Used (for user-visible data): 166
Space Guarantee Style: none
Space Guarantee in Effect: true
Snapshot Directory Access Enabled: true
Space Reserved for Snapshot Copies: 10%
Snapshot Reserve Used: 43%
Snapshot Policy: 3dailys
Creation Time: Tue Apr 12 15:45:58 2016
Language: C.UTF-8
Clone Volume: false
Node name: [redacted]
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: 0B
Fractional Reserve: 0%
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: true
Space Saved by Storage Efficiency: 11.38TB
Percentage Saved by Storage Efficiency: 54%
Space Saved by Deduplication: 1.72TB
Percentage Saved by Deduplication: 8%
Space Shared by Deduplication: 1.57TB
Space Saved by Compression: 9.66TB
Percentage Space Saved by Compression: 45%
Volume Size Used by Snapshot Copies: 2.15TB
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: auto
Is Volume Move in Cutover Phase: false
Number of Snapshot Copies in the Volume: 3
VBN_BAD may be present in the active filesystem: false
Is Volume on a hybrid aggregate: true
Total Physical Used Size: 9.83TB
Physical Used Percentage: 20%
[cluster]::> vol show-space [redacted]
Vserver : [redacted]
Volume : [redacted]
Feature Used Used%
-------------------------------- ---------- ------
User Data 9.70TB 19%
Filesystem Metadata 27.93GB 0%
Inodes 128KB 0%
Snapshot Reserve 5TB 10%
Deduplication 72.02GB 0%
Performance Metadata 72.03GB 0%
Total Used 14.87TB 30%
Total Physical Used 9.83TB 20%
