How to accelerate cache migration

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dstel
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Joined: Thu Oct 15, 2020 2:07 am

How to accelerate cache migration

Post by dstel »

Cache migration is the throughtput between cache and disks.

Find your /dev/mapper/mdX_c device.

# dmsetup message mdX_c 0 migration_threshold 65536
# dmsetup status mdX_c
0 31237754880 cache 8 21971/1049600 128 4628893/7372736 76296 254647 91138 702883 0 71333 3992332 1 writeback 2 migration_threshold 65536 smq 0 rw -

The default is 2048 (I guess this is a block count). Well my writting speed to the disks is now up to 200MB/s when reading the SSD cache and writting to the disks.
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