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Re: [dm-devel] dm-cache caching network volume


Thanks for the reply :-)

I actually uses write-back. Here are the tables :

cache_cacher: 0 1024 linear 254:32 2097152
cache_origin: 0 2048 linear 8:0 0
cache: 0 2048 cache 253:3 253:4 253:2 512 1 writeback default 4 sequential_threshold 2147483648 random_threshold 4
cache_metadata: 0 2097152 linear 254:32 0

8:0 is /dev/sda, the iSCSI target.
254:32 is /dev/vdc, a virtio volume accessing a LV on a SSD.

The thing is : the cache status properlay state that new blocks in cache
are filled, they are even marked as dirty. Which suggest they are not in
the backing device. But actually, it blocks when iSCSI detects the
network failure.

Can dm-cache handle writes without querying the backing device until it
needs demotion ?

Étienne BERSAC <etienne bersac nonstop fr>
NON STOP Systems

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