managin different disk sizes with ceph

benoitc

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Dec 21, 2019
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We have a cluster of 3 machines that have 2x460GB SSD HD on each and we plan to add 2x960GB to each. AT first we were thinking to just replace the 480GB disks but now I am wondering if we can mix disks from different size.


How will work the replication in such case? What's the best pattern for it?
 
How will work the replication in such case? What's the best pattern for it?
Keep them evenly distributed. Ceph will use different ratios for those disks and fill them accordingly.
 
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Keep them evenly distributed. Ceph will use different ratios for those disks and fill them accordingly.
so i just need to add the 2 disks on eahc machines and it wil be good? ie having 2x480+2x960 on each ? That's pretty cool :)
 
To add, in any case (as always) you will need to keep an eye on the usage.
 
Hello @benoitc , I'm starting to implement CEPH here. Could you please report whether this arrangement of yours was successful. did it meet your needs?