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I ave been told that for RAID configurations you don't what to use standard desktop drives because they when/if they enter a error recovery mode they might time out and get dropped from the raid.

Is this true for LVM software RAID or this this a hardware RAID issue primarily?. We are running this server primarily as a backup server and would like to take advantage of the lower price of the desktop drives.

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No. The whole TLER thing is for stupid hardware raid cards that drop the drive if it does not respond quickly. Software raid does not suffer from such foolishness.

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