[Lustre-discuss] OST failover

[Klaus Steden]

Hi,

You interconnect OSS1 and OSS2, OSS2 and OSS3, OSS3 and OSS4, and OSS4 and
OSS1 together via an out-of-band communication fabric, install Linux-HA
heartbeat software to monitor mount points, and configure nodes to take over
each other¹s mounts in case of failure.

The implementation I have here uses only single point-to-point links between
OSS pairs (there is no crossover between failover partners) but the princple
is the same; your implementation should work pretty much the same way, with
a few minor differences. I¹m assuming you¹ve got unused NICs on your OSSes,
so if you connect those to a standard GigE edge switch protected by UPS, you
can create an HA fabric which will give you the coverage you need.

Lustre itself doesn¹t support failover natively, you need to implement any
failover using a third-party package; most of us out there use Linux-HA to
great effect.

cheers,
Klaus

On 8/27/08 2:30 AM, "sd a" <ewsdas at gmail.com>did etch on stone tablets:

> Hi the list,
> 
> I have 4 OSS servers , each OSS has 1 gigabit network interface and 2 OSTs,
> first OST use /dev/sdb1, second OST use /dev/sdb2.
> 
> OSS1: OST1 &  OST2
> 
> OSS2: OST3 & OST4
> 
> OSS3: OST5 & OST6
> 
> OSS4: OST7 & OST8
> 
> 
> Each file is striped across 4 OSTs : OST1,2,3,4
> 
> And I want to setup failover as:
> 
> OST2 failover with OST3
> 
> OST4 failover with OST5
> 
> OST6 failover with OST7
> 
> OST8 failover with OST1
> 
> 
> How do I do?
> 
> Thanks.
> 
> 
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