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For image-level backups (i.e. VMware, Hyper-V, and Windows disk-image), the block size of the actual data to be written in the storage is 512 KB (before compression); After compression, the data size will be reduced to around 200 KB to 300 KB.

Based on this, the optimal stripe size will fall between 128 KB to 256 KB. But due to the environment and various other factors, the stripe size may vary; So we suggest to test it in your environment and finalize the optimal value.