tgtd --bstype aio
Please create option (selector) for use --bstype aio for tgtadm
rdwr : Use normal file I/O. This is the default for disk devices
aio : Use Asynchronous I/O
https://linux.die.net/man/8/tgtadm
On my Servers used Bcache and if full trasfer or backup use standard type rdwr i view in some transfers broke data. After i change target mode to aio all be work good
aio more safe for data
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