[Gluster-users] Explaination needed - Distributed Replicated volume

[Jake G.]

Is there a command to show this type of volume detail I could use?

2013/09/25 15:37、Kaushal M <kshlmster at gmail.com> のメッセージ:

>> On Wed, Sep 25, 2013 at 11:38 AM, Jake G. <dj_dark_junglist at yahoo.com> wrote:
>> Thank you for your reply. Still need a bit of clarification.
>> 
>> If I copy a 20GB file to the volume how can i still have 180GB left if the
>> file gets copied (mirrored) to both glusterfs servers?
>> 
>> My goal is to be able to have redundancy if one of the servers crashes while
>> also being able increase the total amount of available volume space.
>> 
>> Am I thinking about this in the wrong way?
> 
> If each brick you used provides 100GB, then you have a total of 400GB.
> Since you are using replication with 2 replicas, the gluster volume
> will be half that size, 200GB. If you copy a 20GB file to this volume,
> means 20GB of space on the volume is used, leaving 180GB on the
> volume. But, of the total 400GB you had, you will be using up 40GB as
> gluster will make a 2 copies of the file.
> 
>> 
>> 
>> 
>> ________________________________
>> From: Lalatendu Mohanty <lmohanty at redhat.com>
>> To: Jake G. <dj_dark_junglist at yahoo.com>
>> Cc: "gluster-users at gluster.org" <gluster-users at gluster.org>
>> Sent: Wednesday, September 25, 2013 3:10 PM
>> Subject: Re: [Gluster-users] Explaination needed - Distributed Replicated
>> volume
>> 
>> On 09/25/2013 10:52 AM, Jake G. wrote:
>> 
>> HI all,
>> 
>> I have created a Distributed Replicated volume across 2 glusterfs servers.
>> 
>> Type: Distributed-Replicate
>> Status: Started
>> Number of Bricks: 2 x 2 = 4
>> Transport-type: tcp
>> Bricks:
>> Brick1: glusterfs-01:/mnt/glusterfs-data/brick1
>> Brick2: glusterfs-02:/mnt/glusterfs-data/brick1
>> Brick3: glusterfs-01:/mnt/glusterfs-data/brick2
>> Brick4: glusterfs-02:/mnt/glusterfs-data/brick2
>> 
>> If each gluster server gives 100GB to the volume. What is the total size of
>> the volume going to be? 200GB?
>> 
>> The available size of the volume will be 200GB. Because you have a 2X2
>> replicated volume. This means you have 2 pair of replicas. Brick "Brick1:
>> glusterfs-01:/mnt/glusterfs-data/brick1" and "Brick2:
>> glusterfs-02:/mnt/glusterfs-data/brick1" are a replica pair and they are
>> mirror copy of each other. Effectively you will get 100 GB from these two
>> bricks . Similarly from the other pair you will get 100GB.  Total available
>> size will be 200GB
>> 
>> Say I copy a 20GB file to the volume. what would my available size be? 180GB
>> or 160GB?
>> 
>> If you copy 20GB file, the available size would be 180GB.
>> 
>> 
>> Is there a command to view available sizes, usage, etc.. perhaps?
>> 
>> 
>> If you have mounted it on Linux "df" command should help you.
>> 
>> I am a bit confused. Thank you!
>> 
>> 
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>> 
>> 
>> 
>> 
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