On Wed, 24 Aug 2011, Louis-David Mitterrand wrote:
Hi,
I recently ordered a shiny Dell R510 2U server with 12x3.5" drives.
This machine will primarily be a backup host for nightly incremental
rsync runs of a dozen other machines.
Since this is a well-spec'ed box with dual CPUs, generous bandwidth and
32G RAM I'm wondering if it could also do some medium web serving
(mod_perl + postgres).
Medium?
OK, so this is probably not the best place to be asking this stuff, but a
lot will depend on what you mean by medium, however I know of busy
ecommerce sites that are served on much lessser hardware than you have.
For the main backup partition I plan in using a mdadm raid6 on 8x3T
disks and raid6 4x1T disks for the app side.
So my questions are:
- is it realistic to have mix rsync processes and web serving on the
same host?
If the backup is mainly at night and the serving side is mainly during the
day, (but watch for an international audience) then why not?
- am I naive in thinking I can get away with it by using distinct disks
sets for each task?
Seems like an OK idea to me..
- all 12 disks being served by the same H200 controller, will the real
bottleneck be at the controller level?
Possibly..
- any other consideration I should take into account?
The cost of providing separate servers...
However, FWIW, I do something similar with my own hosted LAMP servers - as
well as an offsite backup of critical data, they each rsync to a mirror
overnight and as most of my physical servers are now 'hosts' for virtual
servers using LXC, then in-case of a total hardware failure, I can
actually bring-up the virtual servers on new hardware more or less right
away (minus the data delta since the backup of-course).
Make sure you use a big chunk-size on the RAID-6, and make sure the
underlying filesystem can make use of it too, if possible. (The -Ostride
options for ext3/4 for exmaple) do take time building it and benchmarking
it for your chosen purpose before going live...
Gordon
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