[Linux-cluster] gnbd and caching
Markus Hochholdinger
Markus at hochholdinger.net
Tue Jul 24 15:34:16 UTC 2007
Hi,
i'm running some standalone gnbd servers (option -c) and i'm wondering where
the (read-)caching of the gnbd happens and when/how the cache will be
emptied.
As far as i understand it, the caching happens on the gnbd client. Is this
correct?
If so, when will the cache of the gnbd client be emptied? Will it be emptied
if no one accesses the device? Or will it be cached until the device is
reimported (removed and imported)?
Are there other possibilities to clear the read cache? Are there possibilities
to see how much data is cached (allocated memory of gnbd_recvd)? Or have i to
look for linux page cache?
I'm using gnbd as network block devices for virtual hosts on other servers.
These virtual hosts can be moved between several hardware, but i want to be
sure no old (cached) data will be read by the virtual servers.
--
greetings
eMHa
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