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Displaying posts with tag: MegaCLI (reset)

The perils of uniform hardware and RAID auto-learn cycles
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Last night a customer had an emergency in selected machines on a large cluster of quite uniform database servers. Some of the servers were slowing down in a very puzzling way over a short time span (a couple of hours). Queries were taking multiple seconds to execute instead of being practically instantaneous. But nothing seemed to have changed. No increase in traffic, no code changes, nothing. Some of the servers got sick and then well again; others that seemed to be identical were still sick; others hadn’t shown any symptoms yet. The servers were in master-master pairs, and the reads were being served entirely from the …

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