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CHAPTER 4 DATA STORAGE MANAGEMENT
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To mount the new filesystem, we can use mount -a as we did in the previous section. We can also use the same commands to verify that everything went as planned. Remember that, although we re now using a new device (/dev/md0), it is still treated as a disk, so all the commands that you have practiced before will work equally well here. Now, you need to create a configuration file for mdadm so that RAID starts perfectly on boot up. You can do so manually, but you can just as easily create the file via the mdadm tool itself by running the following command: mdadm detail scan verbose > /etc/mdadm.conf. This command scans all available disks on the system and looks for RAID markers. It collects all of this information and places it in /etc/mdadm.conf. This information is then used by CentOS during booting to re-create the arrays.
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Note: It s considered best practice by the Linux community that you include a spare disk for RAID 1. This disk will be used to rebuild the RAID array should one hard disk fail. Assuming you have another hard disk, hde, and you created a new partition for RAID1 called, hde1, the command to create the RAID device would be mdadm
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create verbose /dev/md0 level=1 raid-devices=2 /dev/hdb1 /dev/hdd1 spare-devices=1 /dev/hde1.
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Checking on RAID
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The easiest way to check on software RAID under CentOS is to look inside /proc/mdstat. We did this before when we were verifying the creation of the RAID array. The kernel puts all status information regarding any software RAID in this file. As before, you can use cat /proc/mdstat to examine this file in more depth. However, this solution relies on the administrator remembering to check the file on a regular basis. Generally speaking, there is no easy way to externally tell if a RAID array is healthy. To get around this, we can tell mdadm to monitor our array for us with the following simple command: mdadm --monitor --mail=your@email.com delay 1800 /dev/md0
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This implementation is very straightforward. The monitor option tells mdadm that it should monitor the given array every 1,800 seconds and, if there are any problems, send an e-mail to your@email.com. This way, you will be alerted as soon as any problems are detected, so you can take action.
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Partitioning with LVM
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Traditionally on the Intel x86 platform, hard disks have only been able to support four primary partitions. It was possible to increase this number using extended partitions and logical partitions, but though workable, this solution wasn t the most elegant. Unfortunately, you simply couldn t fix the problem, as it would require a fundamental change to the platform, which would break compatibility. For the most part, people just lived with it and with tools available to handle the low level details, it wasn t too much of a problem.
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CHAPTER 4 DATA STORAGE MANAGEMENT
Unfortunately, having a limited number of fixed partitions started to become a real nightmare as disk size and usage increased. For example, traditionally users files would be stored on a separate partition mounted on /home. Now, if that partition was 20GB and was starting to get full, we would have to find some space. The problem is that this space will come in the form of another partition, and that s just not very useful. There s no way for us to simply increase the size of /home. Instead, we have to mess about splitting home directories across these two partitions. Apart from the obvious nuisance of having to manage two separate disks, we also need to be aware of how we share the space. For example, it might seem perfectly logical if we decided to put all users whose names begin with A to M on the first partition and then N to Z on the second partition. But what if there are more users in one half than the other Worse, what if there are only a handful of users that use a large amount of disk space, and they all coincidentally end up on the same disk These issues are the key problems that LVM was designed to solve. The main features that LVM provides over traditional partitioning schemes are online resizing of partitions and the ability to add and remove disks as well as create partitions on the fly. If this sounds pretty neat, that s because it is! LVM is one of those technologies that, once you start using it, you ll wonder how you managed to get by without it.
Note: During the install process, CentOS will, by default, set up the disk using LVM. The installer will create a small boot partition (it s not currently possible to boot from an LVM device) and will assign the rest of the space to LVM to create the other partitions that CentOS needs. We will look at this process in more depth later in the chapter.
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