I felt like having a small play with this stuff, as I've been wanting
it for so long :)
But apparently I've made some incredibly newb error.
I used the following two lines to check out the code:
git clone git://git.kernel.org/pub/scm/linux/kernel/git/mason/linux-btrfs.git
raid56-experimental
git clone git://git.kernel.org/pub/scm/linux/kernel/git/mason/btrfs-progs.git
raid56-experimental-progs
Then I did not very much to compile both of them (installed lots and
lots of packages that various places told me would be needed so they'd
both compile) finishing up with a "sudo make install" for both the
kernel and the tools.
Rebooting miracuously it came up with the new kernel and uname -a
assures me that I have a new kernel running:
btrfs@ubuntu:/kernel/raid56-experimental$ uname -a
Linux ubuntu 3.6.0+ #1 SMP Tue Feb 5 12:26:03 EST 2013 x86_64 x86_64
x86_64 GNU/Linux
but 3.6.0 sounds rather low, but it is newer than Ubuntu 12.10's 3.5
so I believe I am running the kernel I just compiled
Where things fail is that I can figure out how to make a raid5 btrfs,
I'm certain I'm using the mkfs.btrfs that I just compiled (by
explicitly calling it in the make folder) but it wont recognise what I
assume the parameter to be:
btrfs@ubuntu:/kernel/raid56-experimental-progs$ ./mkfs.btrfs -m raid5
-d raid5 /dev/sd[bcdef]
Unknown profile raid5
Which flavour of newb am I today?
PS: I use newb in a very friendly way, I feel no shame over that term :)
On Tue, Feb 5, 2013 at 1:26 PM, H. Peter Anvin <h...@zytor.com> wrote:
> Also, a 2-member raid5 or 3-member raid6 are a raid1 and can be treated as
> such.
>
> Chris Mason <chris.ma...@fusionio.com> wrote:
>
>>On Mon, Feb 04, 2013 at 02:42:24PM -0700, H. Peter Anvin wrote:
>>> @@ -1389,6 +1392,14 @@ int btrfs_rm_device(struct btrfs_root *root,
>>char
>>> *device_path)
>>> }
>>> btrfs_dev_replace_unlock(&root->fs_info->dev_replace);
>>>
>>> + if ((all_avail & (BTRFS_BLOCK_GROUP_RAID5 |
>>> + BTRFS_BLOCK_GROUP_RAID6) && num_devices <= 3)) {
>>> + printk(KERN_ERR "btrfs: unable to go below three devices "
>>> + "on raid5 or raid6\n");
>>> + ret = -EINVAL;
>>> + goto out;
>>> + }
>>> +
>>> if ((all_avail & BTRFS_BLOCK_GROUP_RAID10) && num_devices <= 4) {
>>> printk(KERN_ERR "btrfs: unable to go below four devices "
>>> "on raid10\n");
>>> @@ -1403,6 +1414,21 @@ int btrfs_rm_device(struct btrfs_root *root,
>>char
>>> *device_path)
>>> goto out;
>>> }
>>>
>>> + if ((all_avail & BTRFS_BLOCK_GROUP_RAID5) &&
>>> + root->fs_info->fs_devices->rw_devices <= 2) {
>>> + printk(KERN_ERR "btrfs: unable to go below two "
>>> + "devices on raid5\n");
>>> + ret = -EINVAL;
>>> + goto out;
>>> + }
>>> + if ((all_avail & BTRFS_BLOCK_GROUP_RAID6) &&
>>> + root->fs_info->fs_devices->rw_devices <= 3) {
>>> + printk(KERN_ERR "btrfs: unable to go below three "
>>> + "devices on raid6\n");
>>> + ret = -EINVAL;
>>> + goto out;
>>> + }
>>> +
>>> if (strcmp(device_path, "missing") == 0) {
>>> struct list_head *devices;
>>> struct btrfs_device *tmp;
>>>
>>>
>>> This seems inconsistent?
>>
>>Whoops, missed that one. Thanks!
>>
>>-chris
>
> --
> Sent from my mobile phone. Please excuse brevity and lack of formatting.
> --
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--
Gareth Pye
Level 2 Judge, Melbourne, Australia
Australian MTG Forum: mtgau.com
gar...@cerberos.id.au - www.rockpaperdynamite.wordpress.com
"Dear God, I would like to file a bug report"
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