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DataCore strongly recommends configuring a cluster to use Network Time Protocol (NTP) as documented about the timeSource. Windows 200x servers as the NTP time source cannot be used. Windows servers are not reliable enough to provide highly accurate time synchronization as discussed in Microsoft KB article 939322. Consider the following possibilities as an alternative for using time synchronization available in Windows servers:

• Use NTP servers available on the internet, such as the servers discussed on the NTP Pool Project page. Open a port in the firewall to enable the cluster to use external NTP servers.

• Use an open-source NTP package such as the Windows based NTP Time Server Monitor.

• Use a commercial Windows NTP package or deploy a dedicated NTP hardware solution in the network.

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Some non-enterprise-class drives have lengthy error recovery logic. When an error occurs on these types of drives, it may take minutes for a read or write operation to complete. In these cases, the client can experience very long response times or may see a socket timeout if the delay is too long. Many enterprises or server-grade drives are designed to return errors within a limited period and allow recovery or rebuild operations to begin immediately and to eliminate the lengthy delays on I/O operations.

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