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<p class="MsoNormal"><b><span style="font-size:11.0pt;font-family:"Calibri","sans-serif"">From:</span></b><span style="font-size:11.0pt;font-family:"Calibri","sans-serif""> drbd-user-bounces@lists.linbit.com [mailto:drbd-user-bounces@lists.linbit.com]
<b>On Behalf Of </b>Csanad Novak<br>
<b>Sent:</b> Tuesday, May 13, 2014 5:47 PM<br>
<b>To:</b> Arnold Krille; drbd-user@lists.linbit.com<br>
<b>Subject:</b> Re: [DRBD-user] DRDB on one host<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Helvetica","sans-serif"">Hi Arnold,<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Helvetica","sans-serif"">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.<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Helvetica","sans-serif"">Currently I’m using a less than satisfactory solution on non critical servers, as follow:<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Helvetica","sans-serif"">I’ve got mounted my instance-storage as /dev/sdb1 to /var<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Helvetica","sans-serif"">I’ve got mounted my ebs device as /dev/sdc1 to /mnt/var-backup<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Helvetica","sans-serif"">I’ve lsyncd configured to sync from /var to /mnt/var-backup<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Helvetica","sans-serif"">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.<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Helvetica","sans-serif"">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.<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Helvetica","sans-serif"">I must stress again: instance-storage is a local hard-disk based block device, while the ebs storage is a network attached block device.<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Helvetica","sans-serif"">Cheers:<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Helvetica","sans-serif"">Csanad<o:p></o:p></span></p>
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From: Arnold Krille <a href="mailto:arnold@arnoldarts.de">arnold@arnoldarts.de</a><br>
Reply: Arnold Krille <a href="mailto:arnold@arnoldarts.de">arnold@arnoldarts.de</a><br>
Date: 14 May 2014 at 6:18:25<br>
To: <a href="mailto:drbd-user@lists.linbit.com">drbd-user@lists.linbit.com</a> <a href="mailto:drbd-user@lists.linbit.com">
drbd-user@lists.linbit.com</a><br>
Subject: Re: [DRBD-user] DRDB on one host <o:p></o:p></span></p>
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<br>
<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Helvetica","sans-serif"">On Tue, 13 May 2014 09:57:21 +1200 Csanad Novak
<br>
<<a href="mailto:csanad@pixelfusion.co.nz">csanad@pixelfusion.co.nz</a>> wrote: <br>
> Recently on the latest AWS Summit I’ve seen an interesting setup for <br>
> utilising the AWS EC2 instance storage. The instance storage is the <br>
> local filesystem on the Amazon cloud, unfortunately it is not <br>
> persistent - all data get lost if the instance stops. For persistent <br>
> storage one must use an so called EBS volume, which is a network <br>
> attached block device. Unfortunately the EBS storage performance is <br>
> varies, depending on the neighbour instances’ traffic. An ideal world <br>
> one can use the instance storage without the worry of data loss. <br>
> <br>
> On the latest AWS Summit a presenter proposed an architecture where <br>
> the instance storage was utilised and was synced with DRBD to the EBS <br>
> block <br>
> device. <a href="http://www.slideshare.net/AmazonWebServices/so-you-think-you-are-an-aws-ninja-dean-samuels">http://www.slideshare.net/AmazonWebServices/so-you-think-you-are-an-aws-ninja-dean-samuels</a> -
<br>
> slide 11. <br>
> <br>
> I wonder how an example config would looks like. I went trough <br>
> quickly on the tutorials, but couldn’t find any example with one host <br>
> setup. <br>
<br>
drbd on one host. Isn't that what raid/md is? <br>
<br>
I haven't had a chance to play with aws but if both ebs volumes and the <br>
instance-storage are block devices, it should be easy to mirror them <br>
with md or lvm. <br>
<br>
- Arnold <o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Helvetica","sans-serif"">-- <br>
Kind regards,<o:p></o:p></span></p>
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<h1 style="margin:0in;margin-bottom:.0001pt;line-height:11.25pt"><span style="font-size:10.0pt;font-family:"Helvetica","sans-serif"">Csanad Novak<br>
</span><span style="font-size:8.5pt;font-family:"Helvetica","sans-serif";color:#AAC500">Technical Lead</span><span style="font-size:10.0pt;font-family:"Helvetica","sans-serif""><o:p></o:p></span></h1>
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