Re: [Gluster-users] Tiering and sharding for VM workload

[Mohammed Rafi K C]

Yes, you are correct. On a sharded volume, the hot and cold would be
based on sharded chunks.

I'm stressing the point which Krutika mentioned in her mail that we
haven't tested the use case in depth.


Regards
Rafi KC

On 09/06/2016 06:38 PM, Krutika Dhananjay wrote:
> Theoretically whatever you said is correct (at least from shard's
> perspective).
> Adding Rafi who's worked on tiering to know if he thinks otherwise.
>
> It must be mentioned that sharding + tiering hasn't been tested as
> such till now by us at least.
>
> Did you try it? If so, what was your experience?
>
> -Krutika 
>
> On Tue, Sep 6, 2016 at 5:59 PM, Gandalf Corvotempesta
>  > wrote:
>
> Anybody?
>
>
> Il 05 set 2016 22:19, "Gandalf Corvotempesta"
>  > ha scritto:
>
> Is tiering with sharding usefull with VM workload?
> Let's assume a storage with tiering and sharding enabled, used for
> hosting VM images.
> Each shard is subject to tiering, thus the most frequent part
> of the
> VM would be cached on the SSD, allowing better performance.
>
> Is this correct?
>
> To put it simple, very simple, let's assume a webserver VM,
> with the
> following directory structure:
>
> /home/user1/public_html
> /home/user2/public_html
>
> both are stored on 2 different shards (i'm semplyfing).
> /home/user1/public_html has much more visits than user2.
>
> Would that shard cached on hot tier allowing faster access by
> the webserver?
>
>
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> Gluster-users@gluster.org 
> http://www.gluster.org/mailman/listinfo/gluster-users
> 
>
>

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Re: [Gluster-users] Tiering and sharding for VM workload

[David Gossage]

On Tue, Sep 6, 2016 at 7:29 AM, Gandalf Corvotempesta <
gandalf.corvotempe...@gmail.com> wrote:

> Anybody?
>
>
While I have not tested it yet the 2 email chains I have seen from users
trying it is that the performance has been worse rather than any increased
benefit.   Perhaps those using it successfully are just quiet and haven't
responded when others had issues.



Il 05 set 2016 22:19, "Gandalf Corvotempesta"  com> ha scritto:
>
>> Is tiering with sharding usefull with VM workload?
>> Let's assume a storage with tiering and sharding enabled, used for
>> hosting VM images.
>> Each shard is subject to tiering, thus the most frequent part of the
>> VM would be cached on the SSD, allowing better performance.
>>
>> Is this correct?
>>
>> To put it simple, very simple, let's assume a webserver VM, with the
>> following directory structure:
>>
>> /home/user1/public_html
>> /home/user2/public_html
>>
>> both are stored on 2 different shards (i'm semplyfing).
>> /home/user1/public_html has much more visits than user2.
>>
>> Would that shard cached on hot tier allowing faster access by the
>> webserver?
>>
>
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>
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Re: [Gluster-users] Tiering and sharding for VM workload

[Krutika Dhananjay]

Theoretically whatever you said is correct (at least from shard's
perspective).
Adding Rafi who's worked on tiering to know if he thinks otherwise.

It must be mentioned that sharding + tiering hasn't been tested as such
till now by us at least.

Did you try it? If so, what was your experience?

-Krutika

On Tue, Sep 6, 2016 at 5:59 PM, Gandalf Corvotempesta <
gandalf.corvotempe...@gmail.com> wrote:

> Anybody?
>
> Il 05 set 2016 22:19, "Gandalf Corvotempesta" <
> gandalf.corvotempe...@gmail.com> ha scritto:
>
>> Is tiering with sharding usefull with VM workload?
>> Let's assume a storage with tiering and sharding enabled, used for
>> hosting VM images.
>> Each shard is subject to tiering, thus the most frequent part of the
>> VM would be cached on the SSD, allowing better performance.
>>
>> Is this correct?
>>
>> To put it simple, very simple, let's assume a webserver VM, with the
>> following directory structure:
>>
>> /home/user1/public_html
>> /home/user2/public_html
>>
>> both are stored on 2 different shards (i'm semplyfing).
>> /home/user1/public_html has much more visits than user2.
>>
>> Would that shard cached on hot tier allowing faster access by the
>> webserver?
>>
>
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> Gluster-users mailing list
> Gluster-users@gluster.org
> http://www.gluster.org/mailman/listinfo/gluster-users
>
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Re: [Gluster-users] Tiering and sharding for VM workload

[Dan Lambright]

- Original Message -
> From: "Gandalf Corvotempesta" <gandalf.corvotempe...@gmail.com>
> To: "gluster-users" <Gluster-users@gluster.org>
> Sent: Tuesday, September 6, 2016 8:29:06 AM
> Subject: Re: [Gluster-users] Tiering and sharding for VM workload
> 
> 
> 
> Anybody?

Paul Cruzner did some tests with sharding+tiering, I think the intent was to 
investigate the VM workload case. 

In general, at the moment, the larger the transfer size, the better chance 
tiering will be able to help you. Shards of VM images would (I suppose) be 
"large", so your idea may see benefit. The set of webpages/VM shards in your 
example would have to stay relatively stable over time and fit on the hot tier.

> 
> Il 05 set 2016 22:19, "Gandalf Corvotempesta" <
> gandalf.corvotempe...@gmail.com > ha scritto:
> 
> 
> Is tiering with sharding usefull with VM workload?
> Let's assume a storage with tiering and sharding enabled, used for
> hosting VM images.
> Each shard is subject to tiering, thus the most frequent part of the
> VM would be cached on the SSD, allowing better performance.
> 
> Is this correct?
> 
> To put it simple, very simple, let's assume a webserver VM, with the
> following directory structure:
> 
> /home/user1/public_html
> /home/user2/public_html
> 
> both are stored on 2 different shards (i'm semplyfing).
> /home/user1/public_html has much more visits than user2.
> 
> Would that shard cached on hot tier allowing faster access by the webserver?
> 
> ___
> Gluster-users mailing list
> Gluster-users@gluster.org
> http://www.gluster.org/mailman/listinfo/gluster-users
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Re: [Gluster-users] Tiering and sharding for VM workload

[Gandalf Corvotempesta]

Anybody?

Il 05 set 2016 22:19, "Gandalf Corvotempesta" <
gandalf.corvotempe...@gmail.com> ha scritto:

> Is tiering with sharding usefull with VM workload?
> Let's assume a storage with tiering and sharding enabled, used for
> hosting VM images.
> Each shard is subject to tiering, thus the most frequent part of the
> VM would be cached on the SSD, allowing better performance.
>
> Is this correct?
>
> To put it simple, very simple, let's assume a webserver VM, with the
> following directory structure:
>
> /home/user1/public_html
> /home/user2/public_html
>
> both are stored on 2 different shards (i'm semplyfing).
> /home/user1/public_html has much more visits than user2.
>
> Would that shard cached on hot tier allowing faster access by the
> webserver?
>
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