[gpfsug-discuss] AFM misunderstanding

[Mark Bush]

When I setup a AFM relationship (let’s just say I’m doing RO), does prefetch bring bits of the actual file over to the cache or is it only ever metadata?  I know there is a –metadata-only switch but it appears that if I try a mmafmctl prefetch operation and then I do a ls –ltrs on the cache it’s still 0 bytes.  I do see the queue increasing when I do a mmafmctl getstate.  I realize that the data truly only flows once the file is requested (I just do a dd if=mycachedfile of=/dev/null).  But this is just my test env.  How to I get the bits to flow before I request them assuming that I will at some point need them?  Or do I just misunderstand AFM altogether?  I’m more used to mirroring so maybe that’s my frame of reference and it’s not the AFM architecture.


Mark

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