Re: OSD up takes 15 minutes after machine restarts

["huxiaoyu@xxxxxxxxxxxx" <huxiaoyu@xxxxxxxxxxxx>]

HI, Igor,

does this could cause the problem?

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huxiaoyu@xxxxxxxxxxxx

 

From: Igor Fedotov

Date: 2020-01-19 11:41

To: huxiaoyu@xxxxxxxxxxxx; ceph-users

Subject: Re: [ceph-users] OSD up takes 15 minutes after machine restarts

Hi Samuel,

wondering if you have bluestore_fsck_on_mount option set to true? Can you see high read load over OSD device(s) during the startup?

If so it might be fsck running which takes that long.

Thanks,

Igor

On 1/19/2020 11:53 AM, huxiaoyu@xxxxxxxxxxxx wrote:

Dear folks,

I had a strange situation with 3-node Ceph cluster on Luminous 12.2.12 with bluestore. Each machine has 5 OSDs on HDD, and each OSD uses a 30GB DB/WAL partition on SSD. At the beginning without much data, OSDs can quickly up if one node restarts. 

Then I ran 4-day long stress tests with vdbench, and then I restarts one node, and to my surprise, OSDs on that node takes ca 15 minutes to turn into up state. How can i speed up the OSD UP process ?

thanks,

Samuel

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huxiaoyu@xxxxxxxxxxxx

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