Hi Arnold,
I guess the challenge here is that the instance-storage get reseted completely
(back to the point when its just a raw device without partitions) on every
stop/start cycle.
Currently I’m using a less than satisfactory solution on non critical servers,
as follow:
I’ve got mounted my instance-storage as /dev/sdb1 to /var
I’ve got mounted my ebs device as /dev/sdc1 to /mnt/var-backup
I’ve lsyncd configured to sync from /var to /mnt/var-backup
I’ve wrote a little bash script for auto partitioning and mounting. When the
instance get stopped for any reason the instance storage gets reseted and the
whole /var directory destroyed. After boot up my script repartitioning the
instance storage, mount it, and then automatically rsync back the data from
/mnt/var-backup.
There is several issue with this architecture, but the biggest one with lsyncd,
which wasn’t designed for this. If I cloud change lsyncd to drbd, that would
great.
I must stress again: instance-storage is a local hard-disk based block device,
while the ebs storage is a network attached block device.
Cheers:
Csanad
From: Arnold Krille [email protected]
Reply: Arnold Krille [email protected]
Date: 14 May 2014 at 6:18:25
To: [email protected] [email protected]
Subject: Re: [DRBD-user] DRDB on one host
On Tue, 13 May 2014 09:57:21 +1200 Csanad Novak
<[email protected]> wrote:
> Recently on the latest AWS Summit I’ve seen an interesting setup for
> utilising the AWS EC2 instance storage. The instance storage is the
> local filesystem on the Amazon cloud, unfortunately it is not
> persistent - all data get lost if the instance stops. For persistent
> storage one must use an so called EBS volume, which is a network
> attached block device. Unfortunately the EBS storage performance is
> varies, depending on the neighbour instances’ traffic. An ideal world
> one can use the instance storage without the worry of data loss.
>
> On the latest AWS Summit a presenter proposed an architecture where
> the instance storage was utilised and was synced with DRBD to the EBS
> block
> device.
> http://www.slideshare.net/AmazonWebServices/so-you-think-you-are-an-aws-ninja-dean-samuels
> -
> slide 11.
>
> I wonder how an example config would looks like. I went trough
> quickly on the tutorials, but couldn’t find any example with one host
> setup.
drbd on one host. Isn't that what raid/md is?
I haven't had a chance to play with aws but if both ebs volumes and the
instance-storage are block devices, it should be easy to mirror them
with md or lvm.
- Arnold
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