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I want to ask did you had similar experience with upgrading Jewel RGW to Luminous. After upgrading monitors and OSD's, I started two new Luminous RGWs and put them to LB together with Jewel ones. And than interesting things started to happen. Some our jobs start to fail with " fatal error: An error occurred (500) when calling the HeadObject operation (reached max retries: 4): Internal Server Error" error. After some testing, I noticed, it happens only if object is uploaded via Luminous RGW, and downloading via Jewel RGW. Quick googling and upgrade notes read doesn't explained is it normal behavior or something is wrong with my RGW configuration. It's quite old cluster (started as Firefly, I believe) and upgraded several times. My guess is, Luminous is saving RGW data differently and that's why older RGW's fail. I would like to ask, did you had same experience and is it safe to turn all operations on Luminous RGW only? Of course you should upgrade all your Ceph RGW's to Luminous too.
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