What is the deleted inode in the command statistics top file show?
Applies to
- ONTAP 9
- FlexCache
- Remote Access Layer (RAL)
Answer
- After ONTAP enables FlexCache, the command
statistics top file show
may show lots ofdeleted inode
. - The RAL is a feature in the NetApp WAFL® system that enables FlexCache to have a revocable read/write or read-only cache granted on an inode by the origin to a cache. This is the feature that enables FlexCache functionality.
- The RAL is the function FlexCache uses to enable loading and manipulation of content from any volume inside or outside of the cluster to the origin. RAL is a traffic cop to keep the requests, data, delegations, lock requests, and any other information between the FlexCache and the origin in sync.
- So the
deleted inode
is not the user level triggered, it is the FlexCache functionality.
Example:
Cluster1::*> statistics top file show -interval 30 -iterations 1 -max 10 -node nodename
Cluster1: 5/7/2021 14:54:14
*Estimated
Total
IOPS Node Vserver Aggregate Volume File
---------- ----------- ------- --------- ------ ------------------------
11048 nodename - - - (deleted inode 91433752)
9075 nodename - - - (deleted inode 128576766)
9065 nodename - - - (deleted inode 91237522)
9065 nodename - - - (deleted inode 5074842)
9065 nodename - - - (deleted inode 23175658)
9065 nodename - - - (deleted inode 22370608)
9065 nodename - - - (deleted inode 21451531)
9065 nodename - - - (deleted inode 128399903)
Additional Information
Related to TR-4743: FlexCache in ONTAP