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-After fighting with the problem detailed in my Btrfs:RAID_Setup[ last
-post] about this, I decided to go hunting for information about RAID 5
-implementation in btrfs. It turns out that it hasn't been completely
-implemented yet. Given the status verbage on their wiki page, I'm
-surprised it works at all. I suspect the wiki isn't entirely up to date
-though since it does seem to work to a certain extent. I still need to
-do more research to hunt this down though.
-
-You can find that wiki post
-https://btrfs.wiki.kernel.org/index.php/Project_ideas#Raid5.2F6[here].
-
-[[the-new-new-solution]]
-== The NEW New Solution
-
-Since RAID 5/6 is not yet completely implemented in Btrfs, I need to find
-another solution. Given that I still want redundancy, the only other obvious
-option I thought I had here was a
-http://en.wikipedia.org/wiki/Standard_RAID_levels#RAID_1[RAID 1] configuration.
-However, as many Google searches do, searching for something leads to something
-else very interesting. In this case, my search for Linux RAID setups sent me
-over to the official kernel.org
-https://raid.wiki.kernel.org/index.php/Linux_Raid[RAID page], which details how
-to use http://en.wikipedia.org/wiki/Mdadm[mdadm]. This might be a better option
-for any RAID level, despite Btrfs support since it will detatch dependency on
-the filesystem for such support. Everyone loves a layer of abstraction.
-
-[[setup---raid-5]]
-=== Setup - RAID 5
-
-Let's get the RAID array set up.
-
-----
-mdadm -C /dev/md0 -l raid5 -n 3 /dev/sdb1 /dev/sdc1 /dev/sdd1
-# Or the long version so that makes a little more sense...
-mdadm --create /dev/md0 --level raid5 --raid-devices 3 /dev/sdb1 /dev/sdc1 /dev/sdd1
-----
-
-
-[[setup---raid-1]]
-=== Setup - RAID 1
-
-----
-mdadm -C /dev/md0 -l raid1 -n 3 /dev/sdb1 /dev/sdc1 /dev/sdd1
-# Or the long version so that makes a little more sense...
-mdadm --create /dev/md0 --level raid1 --raid-devices 3 /dev/sdb1 /dev/sdc1 /dev/sdd1
-----
-
-
-[[what-just-happened]]
-=== What Just Happened?
-
-[cols=",,,",options="header",]
-|=======================================================================
-|mdadm |-C,--create /dev/md0 |-l,--level raid5 |-n,--raid-devices 3 /dev/sdb1 /dev/sdc1 /dev/sdd1
-|
-|Create a virtual block device at /dev/md0
-|Set the raid level to RAID 5 for our new device
-|The number of RAID devices is 3 - /dev/sdb1, /dev/sdc1, and /dev/sdd1.
-|=======================================================================
-
-
-[[the-rest]]
-=== The Rest
-
-We did just create a RAID array and a virtual device to map to it, but that's
-all. We still need a filesystem. Given that this whole series of posts has been
-about using Btrfs, we'll create one of those. You can still use whatever
-filesystem you want though.
-
-----
-mkfs.btrfs /dev/md0
-mount /dev/md0 /mnt/home/
-----
-
-
-[[mounting-at-boot]]
-=== Mounting at Boot
-
-Mounting at boot with mdadm is a tad more complicated than mounting a typical
-block device. Since an array is just that, an array, it must be assembled on
-each boot. Thankfully, this isn't hard to do. Simply run the following command
-and it will be assembled automatically
-
-----
-mdadm -D --scan >> /etc/mdadm.conf
-----
-
-That will append your current mdadm setup to the mdadm config file in /etc/.
-Once that's done, you can just add /dev/md0 (or your selected md device) to
-/etc/fstab like you normally would.
-
-
-[[simple-benchmarks]]
-== Simple Benchmarks
-
-Here are some simple benchmarks on my RAID setup. For these I have three
-1TB Western Digital Green drives with 64MB cache each.
-
-
-[[single-drive-baseline]]
-=== Single Drive Baseline
-
-[[ext4]]
-==== Ext4
-
-1GB Block Size 1M (1000 blocks)
-
-----
-[root@zion home]# dd if=/dev/zero of=./test.img bs=1M count=1000
-1000+0 records in
-1000+0 records out
-1048576000 bytes (1.0 GB) copied, 4.26806 s, 246 MB/s
-----
-
-1GB Block Size 1K (1000000 blocks)
-
-----
-[root@zion home]# dd if=/dev/zero of=./test2.img bs=1K count=1000000
-1000000+0 records in
-1000000+0 records out
-1024000000 bytes (1.0 GB) copied, 6.93657 s, 148 MB/s
-----
-
-
-[[raid-5]]
-=== RAID 5
-
-[[btrfs]]
-==== Btrfs
-
-1GB Block Size 1M (1000 blocks)
-
-----
-[root@zion home]# dd if=/dev/zero of=./test.img bs=1M count=1000
-1000+0 records in
-1000+0 records out
-1048576000 bytes (1.0 GB) copied, 3.33709 s, 314 MB/s
-----
-
-
-1GB Block Size 1K (1000000 blocks)
-
-----
-[root@zion home]# dd if=/dev/zero of=./test2.img bs=1K count=1000000
-1000000+0 records in
-1000000+0 records out
-1024000000 bytes (1.0 GB) copied, 7.99295 s, 128 MB/s
-----
-
-[[ext4-1]]
-==== Ext4
-
-1GB Block Size 1M (1000 blocks)
-
-----
-[root@zion home]# dd if=/dev/zero of=./test.img bs=1M count=1000
-1000+0 records in
-1000+0 records out
-1048576000 bytes (1.0 GB) copied, 12.4808 s, 84.0 MB/s
-----
-
-1GB Block Size 1K (1000000 blocks)
-
-----
-[root@zion home]# dd if=/dev/zero of=./test2.img bs=1K count=1000000
-1000000+0 records in
-1000000+0 records out
-1024000000 bytes (1.0 GB) copied, 13.767 s, 74.4 MB/s
-----
-
-[[raid-1]]
-=== RAID 1
-
-[[btrfs-1]]
-==== Btrfs
-
-1GB Block Size 1M (1000 blocks)
-
-----
-[root@zion home]# dd if=/dev/zero of=./test.img bs=1M count=1000
-1000+0 records in
-1000+0 records out
-1048576000 bytes (1.0 GB) copied, 3.61043 s, 290 MB/s
-----
-
-1GB Block Size 1K (1000000 blocks)
-
-----
-[root@zion home]# dd if=/dev/zero of=./test2.img bs=1K count=1000000
-1000000+0 records in
-1000000+0 records out
-1024000000 bytes (1.0 GB) copied, 9.35171 s, 109 MB/s
-----
-
-
-[[ext4-2]]
-==== Ext4
-
-1GB Block Size 1M (1000 blocks)
-
-----
-[root@zion home]# dd if=/dev/zero of=./test.img bs=1M count=1000
-1000+0 records in
-1000+0 records out
-1048576000 bytes (1.0 GB) copied, 8.00056 s, 131 MB/s
-----
-
-1GB Block Size 1K (1000000 blocks)
-
-----
-[root@zion home]# dd if=/dev/zero of=./test2.img bs=1K count=1000000
-1000000+0 records in
-1000000+0 records out
-1024000000 bytes (1.0 GB) copied, 9.3704 s, 109 MB/s
-----
-
-
-Those aren't exactly dazzling write speeds, but they're also not too bad, given
-what's happening in the background and that I'm using three standard 7200 rpm
-desktop drives with 64MB of cache a piece. Later down the line I might test
-this with a RAID 0 to see what the max speed of these drives are (though it
-should predictably be three times the current speed).
-
-
-[[final-thoughts]]
-== Final Thoughts
-
-My favorite thing about this at this point is the layer of abstraction doing
-RAID through mdadm provides (we all know how much Linux folk love modularity).
-Using the RAID functionality in Btrfs means I am tied to using that filesystem.
-If I ever want to use anything else, I'm stuck unless what I want to move to
-has its own implementation of RAID.  However, using mdadm, I can use any
-filesystem I want, whether it supports RAID or not. Additionally, the setup
-wasn't too difficult either. Overall, I think (like anyone cares what I think
-though) that they've done a pretty great job with this.
-
-Many thanks to the folks who contributed to mdadm and the Linux kernel that
-runs it all (all 20,000-ish of you). I and many many other people really
-appreciate the great work you do.
-
-With that, I'm going to sign off and continue watching my cat play with/attack
-the little foil ball I just gave her.
-
-
-
-Category:Linux
-Category:Btrfs
-Category:Ext4
-Category:Storage
-Category:RAID
-
-
-// vim: set syntax=asciidoc: