As I was already pushed a bit towards drdb I did a bit searching and found that drdb seems not to slow down things too much (I belive it was about 30% for writing). I am absolutely new to Network RAID and clustering and have a timeframe of about 40 days. As I don't want to make it an adventure I will start simple and use drdb and leave out heartbeat and other HA-stuff for now.
Rsync seems to be possible but not quite the right tool.
With kind regards, Malte Mueller
Greg Freemyer schrieb:
On Mon, 28 Feb 2005 07:57:13 -0800, Mitch (WebCob) wrote:
Hi M
1.: Use drdb to build a RAID1 across the two host's filesystems. If one
host fails, the RAID runs in degraded mode but it runs - or does it
crawl anyway because drdb is slow?
[Mitch says:] I've never used this, and a quick google doesn't give me anything useful - what's the home page?
They have their website hidden at http://www.drbd.org/ ;-)
But if you want to build a failover cluster with drbd as the underlying network RAID1 layer, you will also want to look into Linux-HA. Linux-HA provides the heartbeat / failover logic typically used to manage drbd.
http://www.linux-ha.org
FYI: I don't think Redhat supports any of the above. (They have alternate solutions they prefer.) SUSE OTOH does support both Linux-HA and drbd on there distro. In particular with their SLES server releases linux-ha/drbd is the recommended HA cluster solution and they provide break/fix support.
Since drbd requires kernel patches, I would definately look into a distro that has those built-in.
The linux-ha project is funded / sponsored by IBM and SUSE and has thousands of production installs.
FYI2: I don't know if SUSE SLES officially supports linux-ha/drbd/samba or not.
Greg
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