dm-crypt/cryptsetup and read ahead

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Dear List,

is there any convenient way to set a dm-crypts volume readahead value?
Cryptsetup and the luks metadata seem to lack this option. If one puts a
dm-crypt volume on a raid, aside from aligning it, the crypted volumes
readahead should match the stripe size.
Why does dmcrypt itself not evaluate the current readahead of the
underlying blockdevice and after creating the mapping applies it to the
newly created blockdevice?

Regards

-Sven



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