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Diffstat (limited to 'md.4')
| -rw-r--r-- | md.4 | 9 |
1 files changed, 9 insertions, 0 deletions
@@ -530,6 +530,15 @@ all read and write operations to the array. The default is 128. Increasing this number can increase performance in some situations, at some cost in system memory. +.TP +.B md/preread_bypass_threshold +This is only available on RAID5 and RAID6. This variable sets the +number of times MD will service a full-stripe-write before servicing a +stripe that requires some "prereading". For fairness this defaults to +1. Setting this to 0 maximizes sequential-write throughput at the cost +of fairness to threads doing small or random writes. Valid values are 0 +to stripe_cache_size. + .SS KERNEL PARAMETERS |