Our provider (100Tb) changes failing disks. In fact data center changes these (Softlayer) as 100Tb forwards them the requests, as we have the servers in Softlayer facilities.
Problem we encountered was that provider changed old failing disks with other old failing disks. This is the 3rd time we received old failing hardware as replacement but we checked and got it replaced.
Recovering data and restoring involves a lot of hassle.
Currently 2 of our servers are offline and clients are complaining.
One disk was just changed 1-2 months ago but the "new" one was also a bad one. Now we have to move data again to another drive.
We check every time for SMART errors because we always seem to get failing drives. Now we got 2 drives that are old (13 000 / 7 000 power on hours) but at least these don't show smart errors.
Do you have experience with other data centers?
Does anyone guarantee replacement with new hardware that is... new?
PS: If you want to check your disk stats on centos and don't know how:
yum install smartmontools (installs tool if you don't have it)
smartctl -A /dev/sda (shows under RAW VALUE stats like Power_On_Hours; and errors that show disk is failing Raw_Read_Error_Rate, Current_Pending_Sector, Reallocated_Event_Count ).
Source: http://www.webhostingtalk.com/showthread.php?t=1194962
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