[Gluster-users] DHT vs LVM for multiple bricks on a server

[Gaurav P]

Couldn't find the discussion you referenced in the irc logs going even a
month back :-(

But I will get on the irc channel now and see if someone will rehash it for
me :-) Plus I have a couple more q's.


On Thu, Jan 10, 2013 at 6:27 PM, Joe Julian <joe at julianfamily.org> wrote:

>  I don't have time to write up a long answer right now (work's killing me
> today) but if you search for lvm on the IRC log, we had a bit of a
> discussion about that a few days (or was it a week... they're all blending
> together) ago.
>
>
> On 01/10/2013 03:06 PM, Gaurav P wrote:
>
> *bump*
>
>
> On Mon, Jan 7, 2013 at 8:13 PM, Gaurav P <gaurav.lists+gluster at gmail.com>wrote:
>
>>  Hi,
>>
>>  I've been reading up on GlusterFS and I'm looking for best practices
>> around using multiple disks as bricks in servers that will be part of a
>> replicated volume.
>>
>> Say I start with a single disk each in two servers (/dev/sda1 mounted at
>> /a)
>>
>> gluster volume create test-volume replica 2 transport tcp server1:/a server2:/a
>>
>>
>>  Then I add a second disk in each server (/dev/sdb1 mounted at /b)
>>
>> gluster volume add-brick test-volume replica 2 transport tcp server1:/b server2:/b
>>
>>
>> With this (after rebalancing), am I correct in understanding that I will
>> have a distributed replicated volume with GlusterFS providing the
>> equivalent of RAID1+0 for data on my volume.
>>
>>  Now as I understand, I will be restricted to adding disks (bricks) of
>> the same size whenever I need to extend the volume. What are the pros/cons
>> of instead using LVM to provide a single LV on each server and extending
>> the LV and filesystem each time I add additional storage? The other benefit
>> to LVM being the ability to take snapshots. The one downside I foresee is
>> that a concatenated LV will not use the second PV (disk) till the first PV
>> is full, though I could perhaps stripe?
>>
>> More questions to follow, but I'm trying to think through this before I
>> get started with my first deployment.
>>
>>  TIA
>>   Gaurav
>>
>
>
>
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