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When resilvering the estimated time remaining is calculated using the average issue rate over the current pass. Where the current pass starts when a scan was started, or restarted, if the pool was exported/imported. For dRAID pools in particular this can result in wildly optimistic estimates since the issue rate will be very high while scanning when non-degraded regions of the pool are scanned. Once repair I/O starts being issued performance drops to a realistic number but the estimated performance is still significantly skewed. To address this we redefine a pass such that it starts after a scanning phase completes so the issue rate is more reflective of recent performance. Additionally, the zfs_scan_report_txgs module option can be set to reset the pass statistics more often. Reviewed-by: Akash B <akash-b@hpe.com> Reviewed-by: Tony Hutter <hutter2@llnl.gov> Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Closes #14410 |
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