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Re: Cluster stability with missing qdisk | |
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On 02/10/2012 08:48 AM, Jan Huijsmans wrote:
Hello, In the clusters we have we use a qdisk to determine which node had the quorum, in case of a split brain situation. This is working great... until the qdisk itself is hit due to problems with the SAN. Is there a way to have a stable cluster, with qdisks, where the absence of (1) qdisk won't kill the cluster all together. At this moment, with the setup with 1 qdisk, the cluster is totally depending on the availability of the qdisk, while, IMHO, it should be expendable.
What kind of problems are you trying to avoid? 1) I/O errors -> disk died:solution: set max_error_cycles to something nonzero (1? 2?), and qdiskd will then exit on the host where the problems are occurring when I/O errors are received
2) Long I/O hangs (e.g. path failover)solution: current 3.1.x / 3.2.x differentiates between I/O hangs and I/O errors, so hangs (e.g. due to path failover) no longer cause reboots.
-- Lon -- Linux-cluster mailing list Linux-cluster@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/linux-cluster
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