Jason J. W. Williams wrote:
Hi Mark,
That does help tremendously. How does ZFS decide which zio cache to
use? I apologize if this has already been addressed somewhere.
The ARC caches data blocks in the zio_buf_xxx() cache that matches
the block size. For example, dnode data is stored on disk in 16K
blocks (32 dnodes/block), so zio_buf_16384() is used for those blocks.
Most file data blocks (in large files) are stored in 128K blocks, so
zio_buf_131072() is used, etc.
-Mark
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