2024 Ceph slow requests

Ceph slow requests

Author: dhfv

August undefined, 2024

WebJun 17, 2024 · 1. The MDS reports slow metadata because it can't contact any PGs, all your PGs are "inactive". As soon as you bring up the PGs the warning will go away eventually. The default crush rule has a size 3 for each pool, if you only have two OSDs this can never be achieved. You'll also have to change the osd_crush_chooseleaf_type to 0 so OSD is … WebGood tip. As far as I can see, this particular MDS has log entries of only two types: debug 2024-02-25T17:08:35.975+0000 7f000f96f700 0 log_channel(cluster) log [WRN] : 1 slow requests, 0 included below; oldest blocked for > 4583.532279 secs debug 2024-02-25T17:08:39.003+0000 7f0011973700 1 mds.cephfs.xxx Updating MDS map to version …

[ceph-users] Cephfs MDS slow requests - narkive

WebJan 26, 2016 · Slow requests in Ceph When a I/O operating inside Ceph is taking more than X seconds, which is 30 by default, it will be logged as a slow request. This is to … WebAug 2, 2016 · Slow requests can happen for multiple reasons. It can be slow disks, network connections or high load on machines. If a OSD has slow requests you can log on to the machine and see what Ops are blocking: ceph daemon osd.X dump_ops_in_flight waiting for rw locks. Yesterday I got my hands on a Ceph cluster which had a very high … low income resources florida

Ceph health status reports: Health error: 1 MDSs report slow …

Web4 rows · See the Slow requests or requests are blocked section in the Red Hat Ceph Storage ... WebBecause CephFS has a consistent cache, if your network connection is disrupted for a long enough time the client will be forcibly disconnected from the system. At this point, the kernel client is in a bind: it cannot safely write back dirty data, and many applications do not handle IO errors correctly on close (). WebLuminous 12.2.7 > Ceph cluster, Mimic 13.2.1 ceph-fuse client. Ubuntu xenial, > 4.13.0-38-generic kernel. > > Test case: > 25 curl requests directed at a single threaded apache process (apache2 > -X). > > When the requests are handled by ceph-kernel client it takes about 1.5 > seconds for the first "GET /" (all fs /inode dentrie caches dropped ... jason horner hilson moran

Re: [ceph-users] ceph-fuse slow cache? - mail-archive.com

WebIf an operation is hung inside the MDS, it will eventually show up in ceph health, identifying “slow requests are blocked”. It may also identify clients as “failing to respond” or misbehaving in other ways. If the MDS identifies specific clients as misbehaving, you should investigate why they are doing so. ... WebIssue What are the steps to troubleshoot "slow requests" on an RHCS cluster? Environment Red Hat Ceph Storage 1.2.3 Red Hat Ceph Storage 1.3 Subscriber exclusive content A Red Hat subscription provides unlimited access to our knowledgebase, tools, and much more. Current Customers and Partners Log in for full access Log In New to Red Hat? low income roofingWebIf a ceph-osd daemon is slow to respond to a request, log messages will generate complaining about requests that are taking too long. The warning threshold defaults to 30 seconds, and is configurable via the osd op complaint time option. jason horne francis mother

"WebMay 8, 2024 · CEPH 集群”slow request“问题处理思路什么是“slow request”请求当一个请求长时间未能处理完成，ceph就会把该请求标记为慢请求（slow request）。默认情况 … " - Ceph slow requests

Ceph slow requests

Help: my MDS does not seem to be trimming at all : ceph - reddit

WebBlocked requests and slow requests are synonyms in ceph. They are 2 names for the exact same thing. `ceph health detail` should show you more information about the slow … http://cephdocs.s3-website.cern.ch/ops/cephfs_warnings.html

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WebYou should be able to find requests coming in from the kernel and a response going back out (the function names will be prefixed with "ll_", eg "ll_lookup"). > > So, almost 3 seconds. Page is only served after this, and possibly, after > some cache files have been written. WebThe short version is that even while “ceph -w” is in the midst of. spitting out “Health check update: XX slow requests are blocked >30. seconds” messages, running “ceph …

WebDec 15, 2024 · Hi, ceph health reports 1 MDSs report slow metadata IOs 1 MDSs report slow requests This is the complete output of ceph -s: root@ld3955:~# ceph -s cluster: id: 6b1b5117-6e08-4843-93d6-2da3cf8a6bae health: HEALTH_ERR 1 MDSs report slow metadata IOs 1 MDSs... WebApr 6, 2024 · The following command should be sufficient to speed up backfilling/recovery. On the Admin node run: ceph tell 'osd.*' injectargs --osd-max-backfills=2 --osd-recovery-max-active=6. or. ceph tell 'osd.*' injectargs --osd-max-backfills=3 --osd-recovery-max-active=9. NOTE: The above commands will return something like the below message, …

WebJan 26, 2016 · Slow requests with Ceph: ‘waiting for rw locks’ Slow requests in Ceph When a I/O operating inside Ceph is taking more than X seconds, which is 30 by default, it will be logged as a slow request. This is to show you as a admin that something is wrong inside the cluster and you have to take action. Origin of slow requests Slow … Webdon't think this should directly have anything to do with the slow OSD requests (file locking is ephemeral state, not committed to disk), but if you have new applications running which are taking file locks on shared files that could definitely impede other clients and slow things down more generally. -Greg

WebJun 8, 2024 · client_id: 13400693 MDS_SLOW_REQUEST 1 MDSs report slow requests mdsses-mds-1(mds.0): 4 slow requests are blocked > 30 secs The client machines are responding fine except that cephfs-client2 is stuck on that one directory. The du command is still running... The du command was killed and the process released fine.

WebAug 2, 2016 · Slow requests can happen for multiple reasons. It can be slow disks, network connections or high load on machines. If a OSD has slow requests you can log … jason horne francis collingwoodWebRe: [ceph-users] ceph-fuse slow cache? Yan, Zheng Sun, 26 Aug 2024 21:33:02 -0700 Sun, 26 Aug 2024 21:33:02 -0700 jason horne francis afl statsWebJun 10, 2024 · Subject: Re: ceph mds slow requests; From: "Marc Roos" Date: Wed, 10 Jun 2024 12:23:28 +0200; In-reply-to: <[email protected]> I have this since I am on Nautilus. I did not have this when I was on Luminous and my use of the … low income roof replacement grantWebHi ceph-users, A few weeks ago, I had an OSD node -- ceph02 -- lock up hard with no indication why. I reset the system and everything came back OK, except that I now get intermittent warnings about slow/blocked requests from OSDs on the other nodes, waiting for a "subop" to complete on one of ceph02's OSDs. jason hornick pathologyWebAug 26, 2024 · The graph is created by plotting the slow request logs in ceph.log. It shows that the blocking time is getting longer over time. How to Mitigate the Impact? Move to Local Disk from Ceph Storage The simplest way to mitigate the impact is to move to a local disk from Ceph storage. jason hornik marcus and millichapWebBlocked Requests or Slow Requests If a ceph-osd daemon is slow to respond to a request, messages will be logged noting ops that are taking too long. The warning … low income roofing programs low income resources illinois