Hi Gary, I want to prioritize it because the application can use up to 90% of maximum storage IOPS and it’s normal (we have continuous ingestion with a lot of writes/full document lookups). Unfortunately, SSD is not an option at this time.
Regards, Oleksii From: [email protected] [mailto:[email protected]] On Behalf Of Gary Vidal Sent: Thursday, May 25, 2017 6:44 AM To: [email protected] Subject: [MarkLogic Dev General] Priorities for queries Olekseii, Why would you want to prioritize queries the way you expressed? It would not make sense to deprioritize disk i/o from happening unless you have some issues with disk performance. Consider disk i/o from stand merges to be a natural part of doing business in MarkLogic and any system that does "log level compaction". If you are creating documents in bulk and at same time running queries there are a few techniques you could employ, such as using "fast-data directory" attached to SSD or figure out why your disk's are slow using dd command. Again without knowing your write/read patterns and cardinalities/shape of your data its a very hard problem to answer correctly. But you may want to look at pausing stand merges using blackouts for periods of high query load. But this should be done with extreme caution to your query patterns. Happy to discuss directly with you. Feel free to email for that discussion. Regards, Gary Vidal
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