[Gluster-users] Need help for production setup

Mon Aug 18 02:55:00 UTC 2014

I know what you mean Punit, but think about this:

-Lets say you have 2 servers (serverA and serverB) with 12 drives each,
without RAID and no LVM (which as Ryan pointed could be even worse without
RAID).
-You create a replicated volume between the servers, where drive1 in
serverA is replicated in drive1 in serverB.
-Then one of your drives fail lets say drive1 in serverA. Now you are
covered because its replicated brick in serverB is working.
-BUT how long will it take you to change the drive and heal it? What if
drive1 (the replica brick) in serverB fails now? If this happen... you will
loose all your data in those replicated bricks.

RAID would save you in that scenario, you shouldn't be worried for that
particular problem. As you are using fast drives maybe the healing time
wont be a real problem but... you should think about it.

Regards

2014-08-17 23:20 GMT-03:00 Ryan Nix <ryan.nix at gmail.com>:

> I have mixed feelings on the use of RAID.  If you don't use RAID on a
> machine that has eight drives, for instance, what happens if you lose one
> drive with something like LVM?  As far as I know, that whole system would
> be rendered useless.  Granted, when you're using Gluster, the client
> systems that are attached to the storage can use round robin DNS to find
> the next Gluster node with its data and not skip a beat.  At least with
> RAID you can afford to lose a drive or even two.  Still, I see your point.
> I too would like to not have to waste drives on a RAID set.  I understand
> that Ceph recommends against the use of RAID and I don't know the official
> position with RAID and Gluster.
>
> Sent from my iPad
>
> On Aug 17, 2014, at 9:00 PM, Punit Dambiwal <hypunit at gmail.com> wrote:
>
> Hi Juan,
>
> Thanks for the advise...but if we use the Hardware RAID then what is the
> purpose of using glusterfs ?? We don't want to use HW RAID and want to
> leverage the gluster replication...
>
> If we use the HW RAID that means it will create another overhead (First HW
> RAID replication and second glusterfs replication)...
>
> Thanks,
> Punit
>
>
> On Sat, Aug 16, 2014 at 9:47 PM, Juan José Pavlik Salles <
> jjpavlik at gmail.com> wrote:
>
>> Hi Punit, I'm not Gluster expert however I'm also in the way of building
>> a production gluster like you. What I've read is that even though you are
>> using a replicated volume, is a good practice to have RAID 5 o 6 (depending
>> on the amount of disks) under it. RAID will help you when drives die (which
>> they will) and replication will help you when nodes die (which they will
>> eventually, or maybe some maintenance tasks, power shortagges), so they are
>> two different solutions for two different problems.
>>
>> As far as I know, if you are using the native client to access the
>> gluster volumen you are already using HA.
>>
>> Regards!
>>
>>
>> 2014-08-15 4:39 GMT-03:00 Punit Dambiwal <hypunit at gmail.com>:
>>
>>>  Hi,
>>>
>>> I want to use gluster distributed replicate storage with 4 nodes with
>>> the below configuration :-
>>>
>>>
>>>    - 4 x *Quanta STRATOS S210-X22RQ*
>>>    - 4 x 12 x 512 GB , 2.5″ SSD (front, hot swappable main storage)
>>>    - 4 x 2 x 128 GB, 2’5″ SSD (*rear, hot swappable* os drives, awesome
>>>    feature!)
>>>    - 2 x quality stacked switches (with one leg of each bond device out
>>>    to each switch)
>>>    - IPMI: For Fencing Ovirt.
>>>
>>> I want to use this setup in ovirt...I seek your help to best utilize the
>>> storage with redundancy(even one node failure or any HDD failure) ??
>>>
>>> Do i need to use the HW RAID also...it seems the gluster replication can
>>> do the same...any advise ??
>>>
>>> Also i want it to be high available...if any node goes down the data can
>>> be accessible...please refer any good document for HA with keepalived or
>>> others ??
>>>
>>> Thanks,
>>>  Punit
>>>
>>> _______________________________________________
>>> Gluster-users mailing list
>>> Gluster-users at gluster.org
>>> http://supercolony.gluster.org/mailman/listinfo/gluster-users
>>>
>>
>>
>>
>> --
>> Pavlik Salles Juan José
>> Blog - http://viviendolared.blogspot.com
>>
>
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>
>

-- 
Pavlik Salles Juan José
Blog - http://viviendolared.blogspot.com
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