Le lundi 07 janvier 2008 à 10:34 -0500, Javier Guerra a écrit : > On 1/7/08, Laurent Vivier <[EMAIL PROTECTED]> wrote: > > What I'm wondering now is: is it really useful to have "cache=off" and > > "snapshot=on" at the same time ? > > does "cache=off" means disk cache? if so, it might be useful to test > clustering filesystems.
"cache=off" means files is opened with "O_DIRECT" and thus there is no cache in the kernel memory on the host side. IMO, "cache=off" and "snapshot=on" are incompatible because a snapshot can be seen like a cache. > so far, the only way is to setup a network block device (iSCSI, AoE, > nbd). i'd like to simply specify the same backing file for two > instances' hdb parameter. I'm sorry but I don't understand this part. > and snapshots help a lot to go back after blowing up the on-disk structures But I think if you use a snapshot there is no reason to use "cache=off" Laurent -- ----------------- [EMAIL PROTECTED] ------------------ "La perfection est atteinte non quand il ne reste rien à ajouter mais quand il ne reste rien à enlever." Saint Exupéry
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