Display errors with iostat -e

Dears
What is the cause of this errors with iostat -e
# iostat -e
---- errors ---
device s/w h/w trn tot
sd6 0 1 0 1
ssd0 0 0 0 0
ssd1 33 1866 393 2292
st11 0 0 520 520
nfs1 0 0 0 0

* Everything are going well but I don't know what
exactly happening with my disk. Any suggestion or
helpful steps for secure (data) tomorrow....



:)tHANKS
Mohammed Tanvir



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