<div dir="ltr">I was about to suggest btrfs's internal RAID, but I don't think it would be suitable for the situation you describe. I use it for some personal systems because of its flexibility---you can add and remove disks with ease, and it supports with nonuniform disk sizes, meaning you can incrementally upgrade an array online. With two disks and its raid1 mode you could boot to either disk, provided you installed grub to both.<div><br></div><div><a href="https://btrfs.wiki.kernel.org/index.php/Using_Btrfs_with_Multiple_Devices">https://btrfs.wiki.kernel.org/index.php/Using_Btrfs_with_Multiple_Devices</a></div><div><a href="https://btrfs.wiki.kernel.org/index.php/Balance_Filters">https://btrfs.wiki.kernel.org/index.php/Balance_Filters</a><br></div></div><div class="gmail_extra"><br><div class="gmail_quote">On Fri, May 1, 2015 at 12:23 PM, Omar Eljumaily <span dir="ltr"><<a href="mailto:omar@omnicode.com" target="_blank">omar@omnicode.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">I don't like RAID either for a number of reasons. However, the clients I deal with typically are losing about $500 per hour if one of their main servers goes down. I've actually relied on RAID a number of times. It's saved everybody lots of money and head aches.<br>
<br>
I'd like to go full cloud like on AWS or something, but it's too slow and sometimes too expensive right now. As an alternative, I'm shooting for a main server(s) locally that get archived every night on AWS with the ability to work completely off the cloud if the local server goes down.<br>
<br>
I think the local server will still use RAID. It's just a matter of practicality. 1 TB of data takes multiple hours to restore, and non-active mirrors are marginally reliable at best.<span class="HOEnZb"><font color="#888888"><br>
<br>
Omar</font></span><div class="HOEnZb"><div class="h5"><br>
<br>
<br>
On 5/1/2015 12:10 PM, <a href="mailto:gandalf@sonic.net" target="_blank">gandalf@sonic.net</a> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
I'm not really a big fan of raid. I think your much better off having a second drive and doing a daily rsync. Raid drives typically fail within the same timeframe, also it is not uncommon for a drive to fail in a manner that it corrupts the other drive. Regular backups are much more powerful.<br>
<br>
There I said it. Everyone chime in and tell me I'm an idiot. :-)<br>
<br>
<br>
On 2015-05-01 10:23, Omar Eljumaily wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
Does anybody have any tips for setting up a RAID1 array on Ubuntu?<br>
<br>
I've looked at this:<br>
<br>
<a href="https://help.ubuntu.com/lts/serverguide/advanced-installation.html" target="_blank">https://help.ubuntu.com/lts/serverguide/advanced-installation.html</a><br>
<br>
It suggests setting up<br>
<br>
md0 as a swap partition and<br>
md1 as an ext4 / partition which is also bootable.<br>
<br>
My experience with Centos is to do:<br>
<br>
md0: /boot with ext2<br>
<br>
md1: as an LVM volume creating partitions:<br>
<br>
swap<br>
and / as ext4<br>
<br>
My goal is reliability and to be able to boot into either volume when<br>
the other is degraded. Is there any standard way to do this?<br>
<br>
Thanks,<br>
<br>
Omar<br>
<br>
<br>
<br>
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