[Users] flashcache

[Alexander Kirov]

Hello,

CT's requirements in I/O depend on an user application. 1 Gbit link is enough to supply up to 100 MB/s I/O in PStorage. 
Moreover according our statistic HSPs usually have 10-20 MB/s I/O per node, running tens of containers, because I/O is almost random. So, 1G network should be enough for usual scenarios.
We have many customers with 1G storage backend in production.

BTW, with PStorage you have an additional benefit:
According our statistic 20% of nodes process 80% of I/O in DCs. When you unite disks into one cluster you have better I/O balance. 

Thanks,
Alexander Kirov
Odin Virtuozzo Storage, PM
Odin


-----Original Message-----
From: users-bounces at openvz.org [mailto:users-bounces at openvz.org] On Behalf Of Corrado Fiore
Sent: Monday, November 16, 2015 1:22 PM
To: OpenVZ users <users at openvz.org>
Subject: Re: [Users] flashcache

Hi Nick,

could you elaborate more on the second point?  As far as I understood, pstorage is in fact targeted towards clusters with hundreds of containers, so I am a bit curious to understand where you got that information.

If there's anyone on the list that has used pstorage in clusters > 7 - 9 nodes and wishes to share his or her experience, that's more than welcome.

Thanks,
Corrado

____________________________________________
On 16/11/2015, at 4:44 AM, Nick Knutov wrote:

> Unfortunately, pstorage has two major disadvantages:
> 
> 1) it's not free
> 2) it not usable for more then 1-4 CT over 1 gigabit network in real world cases (as far as I know)


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