This scenario is highly complex, requiring experienced technicians who can diagnose the failed hard drives, restore them to an operational state, and determine the original RAID parameters. If not fixed, this problem can lead to permanent data loss. Instead, the controller marks the replaced drives as “foreign configuration,” due to which the server cannot detect the SAS hard drives leading to data inaccessibility. In this situation, the RAID controller does not recognize the original RAID configuration to allow RAID rebuilding after the hard drive is replaced. Sometimes, the server may fail even after the timely replacement of the failed hard drive. : Stellar ® recovers data from 8 TB SAS drives of a crashed Dell ® storage server It requires advanced in-lab expertise to restore the crashed drive(s) to a functional state, rebuild the RAID, and recover data from SAS hard drive. Sometimes, even the RAID controller may fail to rebuild the array using the pre-configured hot spare due to glitches in the auto-replacement mechanism.ĭata recovery from SAS drives of dead servers is a challenging task. However, delays in swapping the crashed hard drive with a healthy drive can lead to subsequent failures, resulting in a dead server. Notably, issues in a single hard drive don’t cause server crashes but only deprecate the RAID performance. This situation arrives when one or more SAS hard drives comprising the RAID array fail, leading to a server crash. SAS Storage Server Failure: Common Data Loss Scenariosįollowing are some data loss situations associated with SAS hard drives of a failed server: That is one reason the servers with SAS hard drives are preferred in high-performance Enterprise computing environments where high data availability and faster input/output rates are mission-critical. Compared to parallel SCSI drives, commonly known as “scuzzy” drives, SAS hard drives are faster and support Serial ATA (SATA) and SAS drives in a single configuration. RAID-configured Serial Attached SCSI (SAS) hard drives are complex storage arrays used in Enterprise servers, such as Dell PowerEdge ® and HP ProLiant ®.
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