This is a natural condition of bonding, it has little to do with ceph-osd. Make sure your hash policy is set appropriatelly, so that you even have a chance of using both links. https://support.packet.com/kb/articles/lacp-bonding The larger the set of destinations, the more likely you are to spread traffic across both links.
Osd's do not even use bonding effenciently. If it were to use 2 links concurrently it would be a lot better.
https://www.mail-archive.com/ceph-users@lists.ceph.com/msg35474.html
-----Original Message----- To: ceph-users@ceph.io Subject: [ceph-users] Re: small cluster HW upgrade
Hi Philipp,
More nodes is better, more availability, more CPU and more RAM. But, I'm agree that your 1GbE link will be most limiting factor, especially if there are some SSDs. I suggest you upgrade your networking to 10GbE (or 25GbE since it will cost you nearly same with 10GbE). Upgrading your networking is better than using bonding since bonding cannot have 100% of total links bandwidth.
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