Eric at on 23 Oct 2012 11:59:35 -0700

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Re: [PLUG] upgrading system hard drives

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Thanks Rich


On 10/23/2012 01:28 PM, Rich Freeman wrote:
> On Tue, Oct 23, 2012 at 12:48 PM, Lee H. Marzke <> wrote:
>> Try this:
> It really depends on what you're trying to accomplish.  You can use clonezilla, or even just dd to copy the disks at a binary level. Clonezilla MIGHT give you some options for repartitioning, but I don't think it does.

Just want to move existing system to larger hard drive.

> If you just want to do logical file copies, then you do need to set up grub on the new hard drive.  Instructions for that vary depending on whether your distro has an automagic way to do it, and what version of grub you're using.
> If you have a custom kernel build you also need to make sure that it will support your new system, but for just a drive change that isn't terribly likely to be a problem.
> if you're going to do logical file copies you might give thought to whether you really want to stay with ext2.  I'd probably bump that up to at least ext3 if not ext4.  Journaliing is a big improvement in reliability in general, and ext4 has a lot of improvements as well. Anything beyond that is experimental - I wouldn't run btrfs/etc on a server.  For some niches other options like xfs might be ok.

I don't remember if it's currently ext2 or ext3.  I'll see if this
version of RHEL allows that move.

> Oh, and don't run mysql on ext4 - I ended up moving that to ext3 as mysql, ext4, and barriers operate VERY slowly together.  The mysql team says to just turn off barriers, which I guess is a good solution if you don't care about your data, and why you'd bother using a relational database for data you don't care about escapes me.  I guess the postgres crowd would say the same about mysql.  :)
> If you're using LVM or mdadm there are also ways to move your data over to the new drive with zero downtime (well, just a bit of downtime if your hardware doesn't support hot swapping).  You don't have to be down while the data is all copied over.
> But the gist of the original proposal was about right.  Just make sure that grub can find /boot and is installed on the new MBR.  Oh, and mind device numbers with grub and if you aren't using labels for your mount points - if you stick another drive in they might not match up unless you pull your old drive.  You don't want to install grub configured with root on hd1 and then when it boots it is now hd0. That gets a bit arcane to work out.
> Oh, and have a boot CD ready no matter what - it isn't that hard to make little corrections if you have one.
> Rich ___________________________________________________________________________ Philadelphia Linux Users Group         -- Announcements - General Discussion  --

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