Configuration: 16GB RAM, 64GB NVMe L2ARC, 4x6TB RAIDZ2 zpool. Earlier this year I bumped the server from 16GB to 64GB RAM, and I removed the L2ARC. I made no other hardware changes.
Prior to the upgrade the monthly scrub process took 15-20 hours and the four disks would run at their full performance of around 130MB/s for the duration. Now, read performance starts dropping at around the 50% completion mark down to under 40MB/s by the time it finishes. If I pause the scrub, reboot, and resume, then I get the full read performance again, and it will finish the scrub in a reasonable time. Adding the L2ARC back does not make any appreciable difference. Any suggestions about what to look at? I'm genuinely confused by this. -- \m/ (--) \m/ _______________________________________________ Discuss mailing list Discuss@driftwood.blu.org https://driftwood.blu.org/mailman/listinfo/discuss