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leiw
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Slow performance when run second replication

Post by leiw » May 03, 2010 3:38 am

Hello

ESX01 has one VM with 1TB datastorage replica to ESX02, the first manual replication job run yesterday night with success status, then run one hr periodically every schedule job, but I feeling very slow performance.

Is the one hr periodically every schedule job with incremental backup ?

Thansk !

Vitaliy S.
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Re: Slow performance when run second replication

Post by Vitaliy S. » May 03, 2010 9:22 am

Hello,

Could you please clarify some information about your environment:

1. What performance rates are you currently seeing while you run the incremental job run?
2. What job mode are you using for your replication job?
3. What versions of ESX hosts do you have?
4. What is the connection link between your source and target hosts?

Thank you!

leiw
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Re: Slow performance when run second replication

Post by leiw » May 03, 2010 2:33 pm

Hi

1. Where can see it?
2. Network mode.
3. Two ESX4
4. Giga switch and cable.

jgremillion
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Re: Slow performance when run second replication

Post by jgremillion » May 03, 2010 2:52 pm

Are you using some kind of SAN or local storage? If you are using a SAN, you should switch to SAN mode. You really see an increase as the backup of the VMFS volume (.vmbk) file is being done over the SAN and is not coming through the Service Console over the Network. It's much quicker.

Gostev
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Re: Slow performance when run second replication

Post by Gostev » May 03, 2010 6:41 pm

You can see the performance in job session's history for the specific job session. Let us know what processing rates do you see there, please provide results for a few consequent job sessions.

Joe is right, network processing mode is not optimal due to this known issue: Network backup slow on vSphere ESX 4.0. Applying the ESX patch referenced should help to improve the performance, however as Joe correctly suggested, using SAN mode (if you have SAN) or Virtual Appliance mode (if you run Veeam Backup in a VM) should provide better performance without requiring this patch. Unless of course the issue here is with WAN link speed, which does not look to be the case (1Gb LAN).

With 1 hr replication cycles on 1Gb LAN, I would expect each replication cycle to complete in a few minutes even with network processing mode, because there is going to be only a few changed data blocks to move to target each cycle.

leiw
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Re: Slow performance when run second replication

Post by leiw » May 04, 2010 2:08 am

Hi

We do not have SAN storage.

Herre is one seesion screenshot:

Image

Thanks !

Vitaliy S.
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Re: Slow performance when run second replication

Post by Vitaliy S. » May 04, 2010 7:14 am

Hello,

Wow, 1 GB/s is a pretty impressive result for the incremental pass for the network job mode and your setup. Could you also check the size of the vrb file created? Using Virtual Appliance mode will likely increase the processing rate slightly, but for this Veeam Backup must be installed in a VM.

Thank you!

Gostev
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Re: Slow performance when run second replication

Post by Gostev » May 04, 2010 10:24 am

so 1 GB/s is considered "very slow" these days? :D

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