Explanation - CRC errors - performance?

Hi all,

I am just trying to understand why CRC errors would affect performance in SAN and why would they cause long I/O times?

Thanks
codevuAsked:
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IT-Monkey-DaveCommented:
Every CRC error means the same operation has to be retried until there is no CRC error.  

"Give me this data.  Oops, there's an error somewhere in that data.  OK, give me the same data again.  Oh no, there's another error.  Give me the same data yet again..."

CRC = uncorrectable error.  The data is no good.
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IMIronManCommented:
Back-up your data Now.  Then run an error check of the hard drives, preferably with a utility provided by the hard drive manufacturer.  I believe you may have a failing hard drive and delay is caused by the drive halting and the system waiting for the time-out error.
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