Does anyone know why trimming a filesystem mounted on a DRBD volume takes so long? I mean like three days to trim a 1.2TB filesystem.
Here are some pertinent details: OS: SLES 12 SP2 Kernel: 4.4.74-92.29 Drives: 6 x Samsung SSD 840 Pro 512GB RAID: 0 (mdraid) DRBD: 9.0.8 Protocol: C Network: Gigabit Utilization: 10% Latency: < 1ms Loss: 0% Iperf test: 900 mbits/sec When I write to a non-DRBD partition, I get 400MB/sec (bypassing caches). When I trim a non-DRBD partition, it completes fast. When I write to a DRBD volume, I get 80MB/sec. When I trim a DRBD volume, it takes bloody ages! -- Eric Robinson
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