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

[Alex Mandel]

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