Il 2022-06-14 12:16 Zhiyong Ye ha scritto:
After creating the PV and VG based on the iSCSI device, I created the thin pool as follows: lvcreate -n pool -L 1000G test-vg lvcreate -n poolmeta -L 100G test-vg lvconvert --type thin-pool --chunksize 64k --poolmetadata test-vg/poolmeta test-vg/pool lvchange -Z n test-vg/pool
I did my performance test with bigger chunk size, in the range of 128-512K. It can very well be that the overload of a smaller chunk size results in 10x lower IOPs for to-be-allocated-and-copied chunks. Can you retry fio after increasing chunk size?
As a side not, if I remember correcly thin pool metadata is hard limited do 16 GB - no need to allocate 100 GB for it.
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