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ceph故障诊断与排错

ceph

troubleshoot

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CEPH存储峰会PPT，讲解软件定义存储CEPH的常见性能故障解决办法。

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Common Support Issues

and

How to Troubleshoot Them

Michael Hackett and Vikhyat Umrao

PSMEs

Red Hat, Inc.

What are we going to cover today?

● Slow/Blocked Requests

○ What is a slow request?

○ Possible causes

○ Types of Slow Requests

○ Common Troubleshooting Techniques

● Flapping OSD's when RGW buckets have millions of objects

○ Where to start

○ Possible causes

○ Temporary solutions

○ Permanent Solutions

The Dreaded Slow Request!!!

● What is a Slow request?

○ When Ceph detects a request that has taken

too long to process it will get flagged as a

slow request.

● A Slow request will log against an OSD when it

has been unable to service the request in it’s

op_queue queue for 30 seconds or more (default).

○ Configurable via osd_op_complaint_time.

Default is 30 seconds.

● Will be accompanied by blocked requests.

● Changing the osd_op_complaint_time is not

recommended as can lead to false reporting

issues.

Possible Causes

With the understanding of what a slow request is, what can cause these to occur?

● Problems with underlying hardware such as disk drives, controllers, hosts

(kernel or configuration), racks or networking equipment

● System load

● Improper configurables set on OSD’s (op_threads set to high)

● Improper balance in the cluster leading to ‘hot’ OSD’s

● Cluster configuration issues (too many/not enough PG’s per OSD)

● Cluster under backfill/recovery

● Deep scrubbing

● Compaction or splitting is occurring on the OSD node.

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ceph 17.2.6 mon能布署几个？

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