13 Sep 2021 08:45 AM - last edited on 15 Mar 2023 09:16 AM by Ana_Kuzmenchuk
I am trying to understand what might be causing some slow disk problems on a monitored host. We can see that latency shoots up in intervals of 5 minutes, and sometimes reaches 300ms+
Just before that, we can see the throughput go up, but not a ton of data is being written:
From the IOPS metrics, we can see after writes/s go up, so does the queue length:
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The host in question, is it a SQL host? Are there any commits taking place that might cause the latency?
The server uses InterSystems IRIS technology. Which is a database technology, so that could be part of the problem since we see latency go up after some writes.
There are a lot of cases where you might see a slow disk problem. Some I have encountered:
These are some I remember fast. On the funny side, I haven't experienced the following type of proble, at least that I know of: