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a44eaf1690
- Instead of copying one ashift-sized block per ZIO, copy as much as we have contiguous data up to 16MB per old vdev. To avoid data moves use gang ABDs, so that read ZIOs can directly fill buffers for write ZIOs. ABDs have much smaller overhead than ZIOs in both memory usage and processing time, plus big I/Os do not depend on I/O aggregation and scheduling to reach decent performance on HDDs. - Reduce raidz_expand_max_copy_bytes to 16MB on 32bit platforms. - Use 32bit range tree when possible (practically always now) to slightly reduce memory usage. - Use ZIO_PRIORITY_REMOVAL for early stages of expansion, same as for main ones. - Fix rate overflows in `zpool status` reporting. With these changes expanding RAIDZ1 from 4 to 5 children I am able to reach 6-12GB/s rate on SSDs and ~500MB/s on HDDs, both are limited by devices instead of CPU. Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Alexander Motin <mav@FreeBSD.org> Sponsored by: iXsystems, Inc. Closes #15680 Closes #16819 |
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