Question : Problem: Replaced failed drive in Raid-5, but now raid-5 has red X under Logical Devices

Running WIndows server 2003 std.  I have two arrays: one for the OS (raid-1), and one for our data (raid-5). One of the Raid-5 drives failed in the data arry.  Replaced the drive and rebooted the server.  I may of screwed something up...as when it rebooted I went into the adaptec configuration, then exited it and server came up.  Upon opening the Adaptec Storage Manager, I assume I could just "rebuild", however under "Logical devices" it shows the OS array just find, but under the Raid-5 there is a RED X on the raid-5 icon with the following comment " Logical Device 2 - Failed (931.24GB).   My experience with solving these types of issues is limited.   Controller is Adaptec 2820SA.

the only option I have when right-clicing the failed array is "Delete logical device"....at this point I really don't want to do this.   I want to rebuild the array, but I am now stuck.  Many thanks for your help in advance.

Answer : Problem: Replaced failed drive in Raid-5, but now raid-5 has red X under Logical Devices

Hmm, an interesting issue. You have a failed drive, but only one failed drive correct? Removing that drive should not affect the status of the array in the least. Try booting up with just that drive removed, no replacement added in. Does the logical drive show up or is it failed again? If it is failed again, I would suspect that you are removing the wrong drive.

The only reason a RAID 5 will fail is a double fault, and the fact that you could put the drive back and it was operational again supports the thought that you are possibly pulling the wrong drive.

When you pull that drive and it's still failed, is the RAID management software capable of telling you which physical drives are failed [not logical, but the actual physical drives]? What does it say before and after pulling that drive?

Are these 80 pin hot swap drives or are they the good ol' 68 pin internal drives that you have to cable up yourself? If they are the latter, you must be absolutely sure you are setting the SCSI ID properly on the drive. Do not take the drive label for the jumpers at face value, google the product model number and pull up a user guide on how to set the ID properly. Most 68 pin SCSI drives have 4 pins labeled something like SCSI ID 0, 1, 2, 3 ... Fujitsu is especially bad at this. These do not mean that you are setting the drive to ID 0/1/2/3, they are used in various combinations to set the drive to anything between 0 and 15.