[SAC] [support.osuosl.org #23813] OSGeo3 Raid battery replacement

[Justin Dugger via RT]

Battery replaced and web VM modified to use plain disk instead of drbd. Resolving ticket.

Justin

On Fri Apr 25 10:31:46 2014, tech at wildintellect.com wrote:
> On 04/25/2014 10:21 AM, Justin Dugger via RT wrote:
> > See replies inline.
> >
> > On Thu Apr 24 15:47:59 2014, tech at wildintellect.com wrote:
> >> OSL team,
> >>
> >> Now that osgeo4 disks and battery are replaced and working any
> chance we
> >> could to osgeo3's battery tomorrow Friday Apr 24 ~ 1pm PST?
> >
> > Sounds fine.
> >
> >> We've noticed the Web vm is having some big i/o issues. Not sure if
> it's
> >> the raid card, drbd or kvm cache related. One option is to migrate
> Web
> >> over to osgeo4 for now and see if that changes things. Any other
> ideas
> >> are welcome.
> >
> > Caching solutions like varnish tend to reduce I/O demands for
> webapps, but
> > this is sort of hard to debug without poking around the various VMs
> etc.
> >
> Traffic is new to this VM, it had been mostly idle before. I have
> added
> a php caching tool but looks like we might need something more. The
> thing that has us curious is if drbd performance is slowing both
> osgeo3
> and osgeo4 since the Web VM is one of the only machines configured for
> drbd.
> 
> > What I can say is that I/O on osgeo3 is dominated by tracsvn, and
> that
> > replacing the battery should cause the RAID firmware to go back to
> writeback mode.
> >
> That is expected.
> 
> >> We'd probably want to migrate over Secure also while osgeo3 is
> down.
> >> Which might mean we need to turn off something on osgeo4.
> >
> > We can coordinate this over IRC if you desire.
> >
> Yup, I'll be there.
> 
> > Justin Dugger
> > OSU Open Source Lab
> >
> >
> >
> Thanks,
> Alex
>