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Posted to dev@cloudstack.apache.org by Devdeep Singh <de...@citrix.com> on 2012/07/25 11:09:35 UTC
Review Request: HA takes a lot of time to trigger HA if there are multiple
storage pools in a cluster.
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This is an automatically generated e-mail. To reply, visit:
https://reviews.apache.org/r/6133/
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Review request for cloudstack and edison su.
Description
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Bug: HA takes a lot of time to migrate VMs (trigger HA) to another KVM host if there are multiple storage pools in a cluster.
The issue is as follows:
1. When CloudStack detects that a host is not responding to ping requests it'll send a fence command for this host to another host in the cluster.
2. The agent takes a long time to respond to this check if the storage is fenced. This is because the agent checks if the first host is writing to its heartbeat file on all pools in the cluster. It is doing this in a sequential manner on all storage pool.
Making a fix to get rid of sleep, wait during HA. The behavior is now similar to Xenserver.
This addresses bug 15646.
Diffs
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agent/src/com/cloud/agent/resource/computing/KVMHAChecker.java b2df8c1
scripts/vm/hypervisor/kvm/kvmheartbeat.sh c634655
Diff: https://reviews.apache.org/r/6133/diff/
Testing
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Tested the fix by triggering HA on cluster with 4 storage pools. Before the fix an instance was moved to another host int he cluster in more than 20 mins. With the fix the time is now around 4 to 5 mins.
Thanks,
Devdeep Singh
Re: Review Request: HA takes a lot of time to trigger HA if there are
multiple storage pools in a cluster.
Posted by edison su <ed...@citrix.com>.
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This is an automatically generated e-mail. To reply, visit:
https://reviews.apache.org/r/6133/#review9462
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Ship it!
Ship It!
- edison su
On July 25, 2012, 9:09 a.m., Devdeep Singh wrote:
>
> -----------------------------------------------------------
> This is an automatically generated e-mail. To reply, visit:
> https://reviews.apache.org/r/6133/
> -----------------------------------------------------------
>
> (Updated July 25, 2012, 9:09 a.m.)
>
>
> Review request for cloudstack and edison su.
>
>
> Description
> -------
>
> Bug: HA takes a lot of time to migrate VMs (trigger HA) to another KVM host if there are multiple storage pools in a cluster.
>
> The issue is as follows:
> 1. When CloudStack detects that a host is not responding to ping requests it'll send a fence command for this host to another host in the cluster.
> 2. The agent takes a long time to respond to this check if the storage is fenced. This is because the agent checks if the first host is writing to its heartbeat file on all pools in the cluster. It is doing this in a sequential manner on all storage pool.
>
> Making a fix to get rid of sleep, wait during HA. The behavior is now similar to Xenserver.
>
>
> This addresses bug 15646.
>
>
> Diffs
> -----
>
> agent/src/com/cloud/agent/resource/computing/KVMHAChecker.java b2df8c1
> scripts/vm/hypervisor/kvm/kvmheartbeat.sh c634655
>
> Diff: https://reviews.apache.org/r/6133/diff/
>
>
> Testing
> -------
>
> Tested the fix by triggering HA on cluster with 4 storage pools. Before the fix an instance was moved to another host int he cluster in more than 20 mins. With the fix the time is now around 4 to 5 mins.
>
>
> Thanks,
>
> Devdeep Singh
>
>