On Wednesday, June 08, 2011 09:00:48 PM mcclnx mcc wrote: > We have DELL server with MD1000 Disk array in it. O.S. is CENTOS 5.5. > Recently every time MD1000 "patrol read" start I will get "media error" > messages on /var/log/message file. > > I use MD1000 "slow initialize" to initialize "bad disk" and NO error. > After "slow initialize" finish, I manually "startup patrol read". I > continue get "media error" on /var/log/message. > > Anyone know what difference between "slow initialize" and "patrol read"? Only Dell really knows what they mean by it. But here are some random thoughts: * Slow init may write all of the disk during init but maybe: 1) no errors happen during write 2) it notices an error but retries silently 3) it notices an error but has sucky error reporting * Patrolread (may) compare parity data and report this as "media error" (a type of error slow init probably wouldn't detect) * The I/O pattern of patrolread compared to slow init provoks an error You could try to take this issue over to the poweredge-linux mailing list or just case the bad drive with dell support. /Peter
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