Slow replication to RAID5 array

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Slow replication to RAID5 array

Veeam Logoby ECTF » Tue Apr 28, 2015 8:19 am

Hi, We have just purchased a new DELL R730 to act as a disaster recovery host for Veeam Replica's. At the moment this is on site while we complete the initial replica's but will eventually be moved off site.

We are experiencing a very,very slow throughput for the initial replica job and have confirmed this is down to the RAID array which I find rather odd. The server has 4 x 4TB nearline SAS disks 7.2k in a RAID 5 and im replicating to this server at approximately 10-13mb with a new job. If I reconfigure the RAID array and create a single RAID1 mirror using two of the same drives im getting throughput of approximately 70-80mb on a new job.

Surely a raid 5 array cant have that much I/O degradation and slow down the job by 70-80% ? The raid card is a h730

any advice gratefully received to get better throughput on my RAID 5
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Re: Slow replication to RAID5 array

Veeam Logoby Andreas Neufert » Tue Apr 28, 2015 9:06 pm 1 person likes this post

Hi David,

Initial Replication is pretty much sequential write on the target side. If you have problems with sequential writes, then you are in trouble.

I would recommend the following:
1) Update Firmware of your Raid Card (inline with the HCL of VMware)
2) Use actual Veeam Backup & Replication Version
3) Use Default Settings for the Replication Job whenever you can.
4) Place a Proxy VM on this target host and use HotAdd as Proxy Processing Mode.
5) Place a Proxy on Source Host.
6) Select the Proxys four Source and Target at the Veeam Job.

Please come back here and tell us the bottleneck and processing speed again.
Andreas Neufert
Veeam Software
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