ZFS Write Performance Degrades Because All Writes Go to One VDEV
(Doc ID 1405345.1)
Last updated on JANUARY 03, 2023
Applies to:
Oracle Communications Messaging Server - Version 6.0.0 and later Oracle Solaris on SPARC (64-bit) Oracle Solaris on x86-64 (64-bit)
Symptoms
The symptoms can vary, depending on which components are using the ZFS pool having the problem:
The MTA may be slow to accept new incoming SMTP or LMTP connections, because MAX_PROCS processes are already busy with existing connections, which are taking longer than normal.
There may be a backlog of messages in the ims-ms or LMTP channels because it is taking longer than normal to insert them into the store.
IMAP/POP/Convergence response time may be effected.
txn_checkpoint or imdbverify messages in the default log file as in Doc ID 1328634.1.
Changes
A new virtual device (VDEV) was added to the ZFS pool to provide more space.
Cause
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