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TUNING.md

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Raid Speed Limit

The speed limit values here reflect the speed targets of the resync process during periods of inactivity.
These values here are per-disk (not per-array) and are in units of Kibibytes per second. Source

./tuning/speed_limit.sh: <get> <min|max>
./tuning/speed_limit.sh: <set> <min|max> [limit]

./tuning/speed_limit.sh get min
1000 KiB/s

./tuning/speed_limit.sh get max
200000 KiB/s

./tuning/speed_limit.sh set min 30000
./tuning/speed_limit.sh set max 250000

./tuning/speed_limit.sh get min
30000 KiB/s

./tuning/speed_limit.sh get max
250000 KiB/s

Stripe Cache Size

This will set the amount of memory available for the stripe cache.
This value is in units of Kibibytes and must be between 17 and 32768.
memory_consumed = system_page_size * nr_disks * stripe_cache_size Source

Value # Formula Memory
1024 4 =(4*4*1024) 16 MiB
2048 4 =(4*4*2048) 32 MiB
4096 4 =(4*4*4096) 64 MiB
8192 4 =(4*4*8192) 128 MiB
16384 4 =(4*4*16384) 256 MiB
32768 4 =(4*4*32768) 512 MiB
1024 8 =(4*8*1024) 32 MiB
2048 8 =(4*8*2048) 64 MiB
4096 8 =(4*8*4096) 128 MiB
8192 8 =(4*8*8192) 256 MiB
16384 8 =(4*8*16384) 512 MiB
32768 8 =(4*8*32768) 1024 MiB 
./tuning/stripe_cache_size.sh: <get> <raid>
./tuning/stripe_cache_size.sh: <set> <raid> [size]

./tuning/stripe_cache_size.sh get md127
256

./tuning/stripe_cache_size.sh set md127 16384

./tuning/stripe_cache_size.sh get md127
16384