Gordan Bobic wrote:
On Thu, 23 Apr 2009 15:09:23 +0200, Christopher Smith
<csmith@xxxxxxxxxxxxxxxx> wrote:
This is also why quite frequently a cheap box made of COTS components
can complete blow away a similar enterprise grade box with 10-100x
the price tag.
In fairness, those enterprise boxes typically have dual redundant
controllers with mirrored cache, and other failure-resistant goodies you
can't really do with COTS hardware. ;)
Maybe so, but you can still build two complete COTS boxes with
no internal redundancy for a fraction of the cost and deal with
mirroring and fail-over on server level. Enter RHCS and DRBD. :)
Why compromise?
Not every service is failover-friendly at the server level. ;)
Don't get me wrong, I'm 100% behind using COTS stuff wherever possible,
and setups with DRBD, et al, have worked very well for us in several
locations. But there are some situations where it just doesn't (eg: SAN
LUNs shared between multiple servers - unless you want to forego the
performance benefits of write caching and DIY with multiple machines,
DRBD and iscsi-target).
(There's also the labour, maintenance and support costs of DIY vs
plug-in-and-go to consider, as well.)
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