Reclassify crush map

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Hi all,

I want to reclassify my crushmap. I have two roots, one hiops and one
default. In hiops root I have one datacenter and in that I have three rack
and in each rack I have 3 osds. When I run the command below it says "item
-55 in bucket -54 is not also a reclassified bucket". I see the new
crushmap before reclassify-bucket command and item -55 was for my
datacenter! What should I do? If I reclassify my datacenter I will lose my
datacenter!
crushtool -i crush-map --reclassify \
    --reclassify-root default hdd \
    --set-subtree-class default hdd \
    --reclassify-root hiops ssd \
    --reclassify-bucket hiops ssd default \
    -o new-crush-map

Thanks
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