High OSD to Server ratio causes udev event to timeout during system boot

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Hi,

My systems have 56 x 6T disk, dual 12 core processors and 256gb ram.   CentOS 7 x64.

During boot I'm having issues with the system going into emergency mode.   

When starting udevd "a start job is running for dev-disk-by" the timer of 1 minute 30 seconds runs out and the system fails to boot.

I believe this has something to do with the ceph udev rules running out of time before every drive can mount cleanly.   

Has anyone had this issue and can I solve my issue by setting the timeout higher?  Does anyone know what specific systemd process this timeout is affected by?

Please help! Thank you!
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