Re: Virtual Device Support (N-way mirror code)

2013-05-25 Thread Martin Steigerwald
Am Donnerstag, 23. Mai 2013, 18:41:11 schrieb George Mitchell: On 05/23/2013 09:08 AM, Martin Steigerwald wrote: 3) As to my knowledge mount times of large partitions can be quite long with ReiserFS 3. That may well be, but I certainly wouldn't consider btrfs mount times fast in such

Re: Virtual Device Support (N-way mirror code)

2013-05-25 Thread Martin Steigerwald
Am Freitag, 24. Mai 2013, 06:13:04 schrieb Duncan: 2) Due to snapshots I know have well snapshots for my backup. And even on SSD for my /home. I am not yet creating those in an automated way, but well I do use them. As I already mentioned the warning on the wiki, do be aware of the

Re: Virtual Device Support (N-way mirror code)

2013-05-24 Thread Duncan
Martin Steigerwald posted on Thu, 23 May 2013 18:08:35 +0200 as excerpted: Am Dienstag, 21. Mai 2013, 13:19:31 schrieb Martin: Yep, ReiserFS has stood the test of time very well and I'm still using and abusing it still on various servers all the way from something like a decade ago! Very

Re: Virtual Device Support (N-way mirror code)

2013-05-23 Thread Martin Steigerwald
Am Dienstag, 21. Mai 2013, 13:19:31 schrieb Martin: Yep, ReiserFS has stood the test of time very well and I'm still using and abusing it still on various servers all the way from something like a decade ago! Very interesting. I only used it for a short time and it worked. But co-workers lost

Re: Virtual Device Support (N-way mirror code)

2013-05-23 Thread George Mitchell
On 05/23/2013 09:08 AM, Martin Steigerwald wrote: 3) As to my knowledge mount times of large partitions can be quite long with ReiserFS 3. That may well be, but I certainly wouldn't consider btrfs mount times fast in such cases. [root@localhost ghmitch]# time mount LABEL=BACKUP /backup

Re: Virtual Device Support

2013-05-21 Thread Martin
On 21/05/13 04:37, Chris Murphy wrote: On May 20, 2013, at 7:08 PM, Duncan 1i5t5.dun...@cox.net wrote: Chris Murphy posted on Sun, 19 May 2013 12:18:19 -0600 as excerpted: It seems inconsistent that mount and unmount allows a /dev/ designation, but only mount honors label and UUID.

Re: Virtual Device Support (N-way mirror code)

2013-05-21 Thread Martin
Duncan, Thanks for quiet a historical summary. Yep, ReiserFS has stood the test of time very well and I'm still using and abusing it still on various servers all the way from something like a decade ago! More recently I've been putting newer systems on ext4 mainly to take advantage of extents

Re: Virtual Device Support

2013-05-21 Thread George Mitchell
In my case, I am backing up a system spanning five drives formatted btrfs, on a separate drive containing a separate backup volume and multiple complete backups, each from a different point in time. This gives me protection from filesystem corruption, since the backups are on a separate

Re: Virtual Device Support

2013-05-21 Thread Chris Murphy
On May 21, 2013, at 8:06 AM, Martin m_bt...@ml1.co.uk wrote: On 21/05/13 04:37, Chris Murphy wrote: I'm going to contradict myself and point out that mount with label or UUID is made unambiguous via either the default subvolume being mounted, or the -o subvol= option being specified. The

Re: Virtual Device Support

2013-05-20 Thread Duncan
Chris Murphy posted on Sun, 19 May 2013 12:18:19 -0600 as excerpted: On May 19, 2013, at 5:15 AM, Roman Mamedov r...@romanrm.ru wrote: From a user perspective btrfs subvolumes have a lot in common with just regular directories aka folders, and nothing in common with (block)devices.

Re: Virtual Device Support

2013-05-20 Thread George Mitchell
Duncan, The problem affects btrfs volumes that span multiple drive. If you are using btrfs on a single drive that works just fine. But in a multidrive situation, sometimes it works (when umount guesses the right device name) and sometimes it fails (when umount guesses the wrong device

Re: Virtual Device Support

2013-05-20 Thread Chris Murphy
On May 20, 2013, at 7:08 PM, Duncan 1i5t5.dun...@cox.net wrote: Chris Murphy posted on Sun, 19 May 2013 12:18:19 -0600 as excerpted: It seems inconsistent that mount and unmount allows a /dev/ designation, but only mount honors label and UUID. Yes. I'm going to contradict myself and

Re: Virtual Device Support

2013-05-20 Thread Duncan
George Mitchell posted on Mon, 20 May 2013 19:17:39 -0700 as excerpted: Duncan, The problem affects btrfs volumes that span multiple drive. If you are using btrfs on a single drive that works just fine. But in a multidrive situation, sometimes it works (when umount guesses the right device

Re: Virtual Device Support

2013-05-20 Thread George Mitchell
On 05/20/2013 08:59 PM, Duncan wrote: Then I ran into hardware issues that turned out to be bad caps on my 8- year-old mobo (tho it was dual-socket first-gen opteron, which I had upgraded to top-of-its-line dual-core Opteron 290s, thus four cores @ 2.8 GHz, with 8 gigs RAM, so it wasn't as

Re: Virtual Device Support

2013-05-19 Thread Martin
On 10/05/13 15:03, George Mitchell wrote: One the things that is frustrating me the most at this point from a user perspective ... The current method of simply using a random member device or a LABEL or a UUID is just not working well for me. Having a well thought out virtual device

Re: Virtual Device Support

2013-05-19 Thread Roman Mamedov
On Fri, 10 May 2013 07:03:38 -0700 George Mitchell geo...@chinilu.com wrote: One the things that is frustrating me the most at this point from a user perspective regarding btrfs is the current lack of virtual devices to describe volumes and subvolumes. From a user perspective btrfs

Re: Virtual Device Support

2013-05-19 Thread George Mitchell
In reply to both of these comments in one message, let me give you an example. I use shell scripts to mount and unmount btrfs volumes for backup purposes. Most of these volumes are not listed in fstab simply because I do not want to have to clutter my fstab with volumes that are used only

Re: Virtual Device Support

2013-05-19 Thread Martin
OK, so to summarise: On 19/05/13 15:49, George Mitchell wrote: In reply to both of these comments in one message, let me give you an example. I use shell scripts to mount and unmount btrfs volumes for backup purposes. Most of these volumes are not listed in fstab simply because I do not

Re: Virtual Device Support

2013-05-19 Thread Chris Murphy
On May 19, 2013, at 5:15 AM, Roman Mamedov r...@romanrm.ru wrote: On Fri, 10 May 2013 07:03:38 -0700 George Mitchell geo...@chinilu.com wrote: One the things that is frustrating me the most at this point from a user perspective regarding btrfs is the current lack of virtual devices to

Re: Virtual Device Support

2013-05-19 Thread Chris Murphy
On May 19, 2013, at 12:18 PM, Chris Murphy li...@colorremedies.com wrote: It's not possible to mount regular directories with other file systems. In some ways the btrfs subvolume behaves like a folder. In other ways it acts like a device. If you stat the mount point for btrfs subvolumes,

Virtual Device Support

2013-05-10 Thread George Mitchell
One the things that is frustrating me the most at this point from a user perspective regarding btrfs is the current lack of virtual devices to describe volumes and subvolumes. The current method of simply using a random member device or a LABEL or a UUID is just not working well for me.