What are Flushes/min ?

Monitoring and reporting for Veeam Backup & Replication, VMware vSphere and Microsoft Hyper-V

What are Flushes/min ?

Veeam Logoby ortec-RW » Thu Feb 16, 2017 3:57 pm

Hi

Was looking over my VeeamOne monitoring because I'm bored.
On my Hyper-V hosts I was looking at the storage counters in CSV (cluster volumes) in VeeamOne Monitor. Particularly the Virtual Storage Issues, which consist of two seperate counters;

Errors/min
Flushes/min

The Errors/min is pretty obvious, one would want these to be zero. And in my case they are.
But what are Flushes/min ? And should they also be zero or below a certain average ? Looking up the desciption of this counter in VeeamOne brings me no closer to understanding what it means. Is Flushes/min a general term ? Did I miss it until this point in my life ?
Anyone ?

Many thansk.
ortec-RW
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Re: What are Flushes/min ?

Veeam Logoby Andreas Neufert » Thu Feb 16, 2017 10:49 pm 3 people like this post

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Re: What are Flushes/min ?

Veeam Logoby teamerman » Sun Feb 19, 2017 11:47 am

Me too wondered why there are flushes/min, thank you Andreas!
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Re: What are Flushes/min ?

Veeam Logoby cyberjc » Thu Dec 21, 2017 11:46 am

Hi
I am experimenting huge values (between 5000 and 40000 by minute) for this counter with a Centos on Hyper-V and I do not understand why and how can i fix it because (I think it is a cause of disk latency on the host).
I tried to change the I/O scheduler and the sysctl.conf settings with absolutely no effects. Any idea ? Thanks
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Re: What are Flushes/min ?

Veeam Logoby Shestakov » Fri Dec 22, 2017 12:29 pm

Hi Jean-Christophe and welcome to the community.
Have you checked link abouve posted by Andreas?
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Re: What are Flushes/min ?

Veeam Logoby cyberjc » Fri Dec 22, 2017 12:51 pm

Hi, yes and my Windows servers are OK. But as I mentioned the problem occurs with a Linux and is for this reason I tried to change the I/O scheduler and the sysctl.conf settings with absolutely no effects. Still looking
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Re: What are Flushes/min ?

Veeam Logoby Andreas Neufert » Wed Dec 27, 2017 11:15 am

Depending on the workload this could be normal.

Which Filesystem di you use?
Which Applications/DBs? High IO?
Shared VM disk?
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