Can I use tsumufs to provide offline access and wake up NFS server if needed

[Mintman]

Hi all,

I'm looking to avoid turning on my large NFS fileserver except when I
really need it but I want it to turn on transparently when a file
access attempt occurs. Ideally I would have a low power cache node
with only 1 disk (rather than the 9 I have spinning 24x7 in my current
fileserver). This would serve any of the files in the cache to any
computer requesting them and hopefully it would also send a Wake on
Lan packet to the main NFS server is a file access attempt is made to
a file that is not in the cache. Is this possible with tsumufs? It
seems the closest thing I have found to what I'm looking for.

Thanks

Antony

[June Tate-Gans]

I suppose it could be, but this would likely require some fairly heavy
rewriting of some of the internal logic with regard to checking for
fileserver sanity -- not to mention the addition of the Wake-on-LAN
packet functionality. The biggest problem I see, however, is that any
access to a non-cached file would stall the process making it the
entire time it takes for your fileserver to come up post WoL packet.

That being said, TsumuFS could definitely fit the need you have given
enough elbow grease.

--
June Tate-Gans    | Don't try to outweird me, three-eyes. I get stranger things
www.theonelab.com | than you free with my breakfast cereal. -- Zaphod Beeblebrox

[Christian Rost]

I just saw this rather old posting from Antony, and I know have the same problem...

I want a kind of caching frontend-system (always online) for a big nfs-archive-backend-storage-system (almost offline).

The frontend should cache all metadata and files which are read lately and be able to wake up the backend if files (which are not in the cache) 

are requested. Now the tsumufs-project looks dead to me. Does anybody have a hint for me to a alternative software which is able to solve this problem?

Regards

[Sylvain Baubeau]

Not completely sure if it meets your need but I would say FSCache.

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