> On 07/06/2012 12:37 AM, Alexandre DERUMIER wrote:
> >>> all sheeps of one node in the same zone? should be for saftey or?
> > I'm not a sheepdog expert, but i think 1 zone by node is the right way ?
> >
>
> Either is okay for sheepdog, gateway-only node don't count as storage
> node. Storage node (non-gateway-only node) matters because we need
> number of storage nodes >= copies to get cluster running (in case we
> don't set nohalt flat when formatting).
>
> There is something more to notice that non-gateway-only nodes can switch
> to gateway-only node automatically when EIO (for e.g. disk error)
> happens on local disks.
>
> So basically gateway-only mode mostly targets for the case that you just
> want to run sheep daemon as a request forwarder to the cluster (don't
> store any data locally). But yes, you can even run VM through QEMU
> without sheep daemon on local node!
>
> Also we have to keep in mind that we can make advantage of object cache
> (be it write-through mode or write-back mode) optionally to boost
> performance even for gateway-only node.
with sheep daemon on local node you can always connect to localhost, same config on all nodes. Nice for live migration for example.
>
> Thanks,
> Yuan
>
new init script is almost ready
--- snip ---
# sheepdog operation mode
# Mode:
# non-gateway-only mode -v >0, node count as storage
# gateway-only mode -g or -v 0, node don't count as storage
# Sheep daemon arguments
# SHEEPDOG_START_SEQUENCE Postfix of sheeps to start, start one sheep per disc
# SHEEPDOG_DEAMON_ARGS_1 Daemon arguments for sheep postfix _1
# SHEEPDOG_PATH_1 SHEEPDOG_PATH for sheep postfix _1, mount point of disc1
#
# SHEEPDOG_PATH
# Proper LSB systems will store sheepdog files in /var/lib/sheepdog.
# The directory must be on a filesystem with xattr support. In the case of ext3, user_xattr should be added to the
# mount options.
#
# non-gateway-only mode:
# SHEEPDOG_START_SEQUENCE="_1 _2"
# SHEEPDOG_DEAMON_ARGS_1="-p 7000 -v 32"
# SHEEPDOG_DEAMON_ARGS_2="-p 7001 -v 32"
# SHEEPDOG_PATH_1="/var/lib/sheepdog/disc1"
# SHEEPDOG_PATH_2="/var/lib/sheepdog/disc2"
#
# gateway-only mode:
# SHEEPDOG_START_SEQUENCE="_1"
# SHEEPDOG_DEAMON_ARGS_1="-p 7000 -g"
# SHEEPDOG_PATH_1=""
--- snip ---
does sheep generate a pidfile, is there a secret option?
start-stop-daemon --start --quiet -m --pidfile ${PIDFILE}_sheep${SHEEP}.pid --exec $DAEMON
doesn't create the right pid, sheep forks, so at the moment only
# BUG: pid in pidfile is wrong
start-stop-daemon --stop --quiet --retry=TERM/30/KILL/5 --exec=$DAEMON
works and kill all
Cheers Jens
|
|