speaker for this session Mr. Tom Stephens, Sr. TMA VMWare Inc.
recap for this session.
Vmware provides protection at component level, server level, storage level, backup level, site level. FT adds another level of availability to the Virtual Datacenter.
with HA, VMs get restarted. With FT there is zero downtime
it uses some kind of vMotion to create a secondary copy of the FT protected VM
the secondary machine is always up and running but never communicating with the outside world.
FT uses vLockStep Technology: the two VMs are exactly the same and access the same vmdk disk. Only the primary write to disk
AMD Barcelona Intel Penryn or beyond
storage: fc, iscsi, nas
nics: 2 ft logging network 1 gb or better
esx: same ft version on each hosts (release number and patch number)
features: vmware HA must be enabled
VMs must be: 1 vCPU, non thin provisioned, vmware tools recomended, no USB, no floppy, no CDROM, no RDM. No need of special guest drivers or patches
download sitesurvey tool from vmware site and run against hosts to kmow if you can enable FT on your hosts.
while doing storage vMotion disable FT duringnthe task.
do not put too many FT protected VM primary on the same host
mix protected and ghist machine
consider 10 GB link for logging NIC if possible
if latency is less than 1 millisecs this improves guest networking performances
FT on demand, during specific lapse of time, end of the quarter,... etc
where to use FT
Databases medium size DB
Exchange with < 1000 users
remote branch office many workload that cannot be clustered
custom application not application aware
in SAP, Ascs (messages and transaction locking service) is a spof and should be, for example, configured for FT.
BES is a good candidate (1vcpu with 200 users receiving 200 emails a day)
when you enable ft there is a spike on the net while creating the ghost machine.
impact on CPU is <10%
introduces some IO latency NOT users experienciable
traffic on the network depends on the workload of the primary VM: a gigabit is sufficient for most workloads
on Oracle 11g performance is quite the same
on Exchange FT has small impact on Exchange Virtual Machine performances circa 1.5% worst than without FT)
Nahalem do a great job in conjunction with FT.