[pve-devel] [PATCH] Increases the dd read/write speed when migrating LVM disks. This should bring LVM migration speed up to match that of rsyncing qcows.

[Alexandre DERUMIER]

>>IMHO a block size of 64MB is a bit too large. I guess you can see the same 
>>speed improvements with much smaller sizes - mabe 1M is large enough?

I think a value which can be handle by disk cache is ok. (1M should be large enough, if the disk can do 200iops, it's around 200MB/S)

----- Mail original -----
De: "dietmar" <dietmar at proxmox.com>
À: "jlavoy" <jalavoy at gmail.com>, "pve-devel" <pve-devel at pve.proxmox.com>
Envoyé: Mardi 23 Août 2016 10:26:38
Objet: Re: [pve-devel] [PATCH] Increases the dd read/write speed when migrating LVM disks. This should bring LVM migration speed up to match that of rsyncing qcows.

> + run_command([["dd", "if=$src", "bs=64M"],["/usr/bin/ssh", 
> "root\@${target_host}", 
> + "dd", 'conv=sparse', "of=$dst", "bs=64M"]]); 

IMHO a block size of 64MB is a bit too large. I guess you can see the same 
speed improvements with much smaller sizes - mabe 1M is large enough? 

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