Take the 2-minute tour ×  We have a particular sub-platform with
around 900 web-facing RHEL VMs (on ESXi 4U2 if that helps). Each
VM runs a custom application that logs to a per-VM file, we
don't want these logs to get very big as we want the VMs to be
small. What we've been doing to far is to get each VM to put
it's file in a shared NFS mount, each named after the VM.  This
has worked a treat, until yesterday when we lost half a shelf in
the NetApp box running the NFS server - although it's all
RAID'ed and has dual controllers we needed to switch the whole
system off to swap the shelf (one aggregate has multiple members
per shelf). At which point the VMs can't write their logs and we
lost all this logging data.  So to the actual question, what I'd
like to do is have the VMs each write to a file local to
themselves (i.e. within the .vmdk), then have a process that
updates the central NFS copy with any updates to this local file
and clears the local file, if the NFS is down this doesn't
happen and the local fi