Различные проблемы с программным обеспечением raid1 массив, созданный с Samsung 840 Pro SSD
Вам не нужна связка ключей.
используйте ssh-keygen, сделайте новую пару ключей. deply открытый ключ на целевом сервере и префиксе это с командой как это
command="/bin/ls" ssh-dss YOURKEEEEEEEYHERE ==comment
в .ssh/authorized_keys на том удаленном хосте
когда это будет установкой, Вы сможете работать точно что команда на удаленном хосте через ssh, использующий пароль.
Well in the end I guess I found out at least a big part of the problem: one of the SSDs in the array was functioning really badly. I have read enough reports of poor mdraid performance concerning Samsung 840 Pro SSDs but this drive was functioning very poorly even when used by itself. For the time being I have fixed it by performing a secure erase of the SSD in question by using hdparm. The performance is nothing to brag about but it's much closer to decent than before: about 210-220MB/s read and about 130-150MB/s write (compared to 5-10MB/s write before). Please note this is on SATA2 where the top speed is about 240MB/s.
In the end I'd like to say thanks to Mr. Wagner who's advice to swap the drives proved illuminating.
In conclusion when you have performance issues with a SSD consider a secure erase! Please note a secure erase is not the same with formating.