Cache: L2ARC Errors

This statistic shows 2nd Level Adaptive Replacement Cache (L2ARC) error statistics.

When to Check L2ARC Errors

This can be useful to leave enabled when using cache devices, for when troubleshooting L2ARC issues beyond the standard statistics.

L2ARC Errors Breakdowns

Available breakdowns:

Table 6-7 A Breakdown of L2ARC Errors

Breakdown	Description
error	L2ARC error type; see the following table.

L2ARC error types:

Table 6-8 L2ARC Error Types

Error	Description
memory abort	The L2ARC chose not to populate for a one-second interval, due to a shortage of system memory (DRAM), which holds the L2ARC metadata. Continual memory aborts will prevent the L2ARC from warming up.
bad checksum	A read from a cache device failed the ZFS ARC checksum. This might be an indicator that a cache device is beginning to fail.
io error	A cache device returned an error. This might be an indicator that a cache device is beginning to fail.