On 1/6/2011 8:09 AM, Timo Schoeler wrote:
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thus Digimer spake:
On 01/06/2011 03:27 AM, Felix Frank wrote:
In any case, be sure to have (at least) RAID 1 on each node backing the
DRBD devices to help minimize downtime. Drives fail fairly frequently...
software RAID 1 is an inexpensive route to much better uptime. :)
If the budget isn't severely restricted, I'd also throw in an actual
RAID controller, software RAID being an unnecessary pain.
Cheers,
Felix
If I may provide a counter-point arguing in favour of software RAID;
With hardware RAID, you array and your data is bound to that controller.
Should the controller fail at some point, you will find yourself
scrambling trying to find a compatible controller, and you will be down
until you do (shy of falling back to recovering from backup). I had this
happen to me enough that I now won't use hardware RAID unless it's for
performance (or similar) reasons the make software RAID unfeasible.
With software RAID, you have a familiar set of tools (mdadm) that many
people can help you with. More importantly though, you can move your
array to almost any other machine and get it up and running again with
relatively little effort, potentially dramatically reducing your mean
time to recovery.
I may add that in most cases management as well as performance
monitoring of a software will run like a charm compared to most
solutions and tools vendors offer - regardless of what OS you use.
Cheers!
Thanks for the suggestions. I've been using linux software raid for
years, and I've been very pleased with the results. Never lost a bit
actually :) After doing some research, I've decided to hold off on the
SSD drives until I get the system up in a state that can be tested with
the platter-based hard drives. After doing a lot of reading (like
anandtech.com), I'm worried about the long-term stability of SSD
devices. Also, the price differences between the "consumer-grade
crapware" and "enterprise-level sweetness" is pretty big. I was looking
at getting some ocz vertex 2's, but stability concerns really scared me.
I don't think x25's are in my budget (for the size I want).
I'm going to set it up first with platter-based HDD's (4 total, each
host with raid1). Have 1 MD device (PV) running under lvm with 3 lv's.
One for system partition, one for app1 that will be under drdb and one
for postgresql and mysql that will be under drdb.
If needed, I'll throw in 4 more disks, make another vg and migrate
postgresql/mysql data to that.
Again, Thanks for all your recommendations!
J
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