Re: [LSF/MM TOPIC] linux servers as a storage server - what'smissing?
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On 01/24/2012 12:05 PM, Loke, Chetan wrote:
But writes that have to fetch the non-cached data, willunnecessarilyissue I/O to the fabric. These orphaned I/O's cause more pain in the cleanup. And if caching is enabled on the front-side then it's all the more painful. We can go one extra step and make FS fail read I/O for non-cacheddatatoo to avoid more orphan IOs.I don't really see this as a useful state. Read-only without a real backing file system or LUN is hit or miss, that file system should go offline :)Last year when I checked, I forget but I think xfs(or ext4) was going read-only. If this is still the case then you are basically asking FS's to modify that behavior.
Not really.I think that at that state, we need to be able to cleanly umount those file systems and clean up the system without requiring a reboot.
Read-only state is not a usable condition for a file system without a backing device, just an side effect of our error handling...
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