Messages in this thread | | | From | Johannes Thumshirn <> | Subject | [PATCH RFC 0/3] btrfs: zoned: reclaim block-groups more aggressively | Date | Thu, 28 Mar 2024 14:56:30 +0100 |
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Recently we had reports internally that zoned btrfs can get to -ENOSPC prematurely, because we're running out of allocatable zones on the drive.
But we would have enough space left, if we would reclaim more aggressively.
The following fio-job is an example how to trigger the failure.
[test] filename=$SCRATCH_MNT readwrite=write ioengine=libaio direct=1 loops=2 filesize=$60_PERCENT_OF_DRIVE bs=128k
The reason this is still an RFC is, it is enough to have DATA block groups free but not METADATA block groups. Of cause the same principle could be applied to METADATA block groups as well, but I'd prefer to have a discussion on the general direction first.
--- Johannes Thumshirn (3): btrfs: zoned: traverse device list in should reclaim under rcu_read_lock btrfs: zoned: reserve relocation zone on mount btrfs: zoned: kick cleaner kthread if low on space
fs/btrfs/disk-io.c | 2 ++ fs/btrfs/zoned.c | 56 ++++++++++++++++++++++++++++++++++++++++++++++++++++-- fs/btrfs/zoned.h | 3 +++ 3 files changed, 59 insertions(+), 2 deletions(-) --- base-commit: c22750cb802ea5fd510fa66f77aefa3a0529951b change-id: 20240328-hans-2c9e3b4a69e8
Best regards, -- Johannes Thumshirn <jth@kernel.org>
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