[Gluster-users] Problem With AFR

[Keith Freedman]

At 08:13 AM 3/6/2010, Chad wrote:
>I second this question/request.
>When the 1st server goes down, how do we 
>eliminate the hang time? 5 seconds is a long time for a file system to be hung.

it is a long time, but if you think about other 
HA filesystems, this is one of the shortest I've seen.

hardware NAS devices, when there's a node 
failure, will often take 30 seconds to 2 minutes 
to fully recover.  In light of the alternatives, 5 seconds is remarkable.

if you're getting these delays on a regular basis 
then something is wrong, but if it's something 
that just happens in the face of a failure, then it should be relatively rare.
if it happens all the time, then you really need 
to figure out why your systems are failing and resolve that problem.

Just my .02

>^C
>
>
>
>Richard de Vries wrote:
>>Hello Eduardo,
>>We had the same problem over here, with two nodes that are both server
>>and client.
>>You can try to lower the ping-timeout in the client volume file:
>>option ping-timeout 5
>>5 seconds is the sadly the lowest possible ping-timeout, our
>>applications on the main node can hang for about 5 seconds in case the
>>standby node fails (although we have a dedicated interconnect).
>>Maybe the gluster developers have a better solution to this.
>>Regards,
>>Richard
>>
>>>Hi i´m using GlusterFs V3.0.2 in Fedora 12.
>>>
>>>I have configure AFR with 3 nodes and mount the volume in the client, its
>>>work fine, but when a node fail, the file system in the client locks and I
>>>can´t execute any operations for about 40 to 50 Seconds.
>>
>>>After 40 to 50 Seconds the File system on the client start to work again.
>>>How I can resolve this problem, because the file system can´t bee
>>>inaccessible for so long Time.
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