[pve-devel] Speed up PVE Backup

[Alexandre DERUMIER]

>>This is how it works right now ;) - not flushing doesn't mean system 
>>won't write data; it can just do so when it thinks is a good time.

If think is true with filesystems (fs will try to flush at regular interval), 
but I'm not sure when you write to a block device without doing any flush.

I remember in past to use cache=unsafe with qemu, and a scsi drive, I was able to write gibabytes of datas in host memory
without any flush occuring.



----- Mail original -----
De: "Eneko Lacunza" <elacunza at binovo.es>
À: "pve-devel" <pve-devel at pve.proxmox.com>
Envoyé: Mardi 26 Juillet 2016 13:19:28
Objet: Re: [pve-devel] Speed up PVE Backup

Hi, 

El 26/07/16 a las 10:32, Alexandre DERUMIER escribió: 
>>> There is no reason to flush a restored disk until just the end, really. 
>>> Issuing flushes every x MB could hurt other storages without need. 
> I'm curious to see host memory usage of a big local file storage restore (100GB), with writeback without any flush ? 
This is how it works right now ;) - not flushing doesn't mean system 
won't write data; it can just do so when it thinks is a good time. 

Cheers 


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