- luv-main - luv.asn.au

Increasing capacity on ZFS
by Brett Pemberton 23 Jul '12

23 Jul '12

Hi, I've begun testing/commissioning a new storage server at home, trying to make it expandable in the future, as 3tb drives become cheaper. I decided to give ZFS on FreeBSD a try, and this is what I'm on now, however the issues I'm having apply equally to zfsonlinux/ZFS using FUSE, so I'm hoping to grab some help here. I knew upfront that you can't add devices to a zpool, so to make this expandable, I took the approach of maxing out my case hard drive space, with the plan of simply replacing the drives with bigger capacity as they fail, or as new drives become cheap. My current system has 2 x 64GB SSDs for OS, and a ZIL (mirrored) and started with 8 x 500gb drives. A mix of PATA and SATA, which isn't ideal, but is what I had spare. Yesterday I did a replace of one of the 500gb drives with a 1.5TB drive I also had spare. The issue I've hit is that although the zpool has seen an increase in capacity, the zfs filesystem has not. Googling and IRC have been unable to help with this, so running it by LUV, considering this portion of the system is OS independent. My relevant history lines are: 2012-07-17.20:04:15 zpool create -f storage raidz ada0 ada1 ada4 ada5 ada6 ada7 ada8 ada9 2012-07-17.20:04:41 zfs create storage/tbla 2012-07-17.20:04:52 zfs set sharenfs=on storage/tbla 2012-07-17.20:04:59 zfs set atime=off storage/tbla 2012-07-17.20:05:15 zpool add -f storage log mirror/gm0s2a 2012-07-17.20:19:27 zfs sharenfs=-maproot=0:0 storage/tbla 2012-07-21.13:33:29 zpool offline storage ada8 ... reboot, replace drive ... 2012-07-21.15:20:40 zpool replace storage 5231172179341362844 ada8 2012-07-21.16:06:17 zpool set autoexpand=on storage ... ^^^ note that this was run while the resilver was in operation ... 2012-07-21.16:46:16 zpool export storage 2012-07-21.16:46:34 zpool import storage 2012-07-21.16:54:02 zpool set autoexpand=off storage 2012-07-21.16:54:07 zpool set autoexpand=on storage 2012-07-21.17:34:12 zpool scrub storage [root@swamp /usr/home/brett]# zpool list NAME SIZE ALLOC FREE CAP DEDUP HEALTH ALTROOT storage 3.62T 701G 2.94T 18% 1.00x ONLINE - Before the replace, storage was showing 3.1T size, I believe. So it jumped by 500gb, which seems about right. [root@swamp /usr/home/brett]# zfs list NAME USED AVAIL REFER MOUNTPOINT storage 609G 2.51T 50.4K /storage storage/tbla 609G 2.51T 609G /storage/tbla [root@swamp /usr/home/brett]# df -h Filesystem Size Used Avail Capacity Mounted on /dev/mirror/gm0s1a 18G 3.1G 14G 18% / devfs 1.0k 1.0k 0B 100% /dev storage 2.5T 50k 2.5T 0% /storage storage/tbla 3.1T 609G 2.5T 19% /storage/tbla I'm also slightly confused as to why storage shows a size of 2.5T, while storage/tbla has 3.1. And clearly neither has the 3.62 which is in the zpool. Can anyone explain this to me? Note that this is still in testing phase, so I'm happy to start from scratch, destroy the FS and try again with all 500gb drives, then do the replace again, if I missed a step somehow. It's more important to me that I get the procedure correct, so that once this is production, I know what's going on. cheers, / Brett

3 7

converting to BTRFS
by Russell Coker 22 Jul '12

22 Jul '12

I've got some filesystems I want to convert to BTRFS. I recall someone saying that BTRFS had some issue with lots of symlinks, I have a filesystem with 200G of data in 1,400,000 Inodes that's used by "cp -rl" copies of an rsync backup - would this be an issue? Also how much space should there be available for a conversion from Ext4 to BTRFS? Obviously the default of two copies of metadata gives the potential for a conversion to run out of disk space. What happens when btrfs-convert finds that it doesn't have enough disk space, can it be relied on to give a result of either an Ext4 or a BTRFS filesystem that is correct and contains all the data? -- My Main Blog http://etbe.coker.com.au/ My Documents Blog http://doc.coker.com.au/

2 1

OLPC laptop to give away
by Geoff Crompton 21 Jul '12

21 Jul '12

At the Brisbane linux conf I one an OLPC laptop in the photo competition. I haven't really done anything with it, and now that I'm moving house, I'd like to pass it on to someone who can make better use of it. Any takers? Cheers, Geoff Crompton

1 0

Notes from "LaTeX and typesetting" talk
by Jason White 19 Jul '12

19 Jul '12

The notes and references from my talk at yesterday's Luv meeting are available at http://jasonjgw.net/latex-presentation/ and you will find a list of references at http://jasonjgw.net/latex-presentation/latex-references.html A few people asked about these after the talk, thus I am posting details here. As an additional note, if you want word-by-word diffs of revisions of a TeX document in Git, use the --word-diff option of git diff, after adding the following line to your .gitattributes file (creating that file in the top-level repository directory if required). *.tex diff=tex See the gitattributes(5) manual page and the git-diff(1) manual page for details of word diffs, including colour highlighting support.

4 5

Re: Any USB 3G broadband usable under Linux?
by Tony Langdon 17 Jul '12

17 Jul '12

At 11:41 AM 7/16/2012, Brian May wrote: >On 15 July 2012 21:16, James Harper <james.harper(a)bendigoit.com.au> wrote: > > I'm all for Microsoft bashing, but if you are implying that > Windows doesn't support IPv6 then you are very wrong. In fact > you'll have trouble with some of their server software if you disable IPv6. > >Lots of people still use Windows XP, which doesn't have built in IPv6 >support. I believe there is an add-on that provides IPv6 support, >however this was the first attempt Microsoft made, and as a result not >recommended for serious use. Or so I have read. You can run IPv6 on XP by issuing the command: ipv6 install However, as you say, it's not a production quality stack, though it does work fine for everyday end user purposes (I've used it extensively). Configuration is not done by the control panel, you need to use special commands and/or registry tweaks. 73 de VK3JED / VK3IRL http://vkradio.com

4 3

Re: Any USB 3G broadband usable under Linux?
by Tony Langdon 16 Jul '12

16 Jul '12

At 11:46 AM 7/16/2012, Brian May wrote: >On 16 July 2012 08:55, hannah commodore <hannah(a)tinfoilhat.net> wrote: > > Sorry. I stand corrected. > > Is it just Telstra consumer plans that use internal ip addresses > on 3G then? > >I think Three also does that too. Yes, Three is still a separate >network to Vodofone, at least last time I checked, even if now owned >by the same company. I would assume Vodofone also uses internal IP >addresses, but can't confirm/deny. Three was issuing public IPs on their broadband only plans, but private IPs on voice/data plans last time I used them (a couple years ago - it was too expensive to use once I left Melbourne and I dropped it as soon as the contract expired). 73 de VK3JED / VK3IRL http://vkradio.com

1 0

RE: Any USB 3G broadband usable under Linux?
by Tony Langdon 16 Jul '12

16 Jul '12

At 05:49 PM 7/15/2012, you wrote: >Rumour also has it that Telstra has pinched some 3G spectrum for use >on its 4G network. We have some customers in Bendigo CBD where >Telstra 3G is effectively useless since 4G trials started (Optus >works fine), so the rumour would be one explanation for that... The performance observations are true, I have no idea on the rumour, but it sounds plausible. Telstra has been pretty crap up here for the last year or so. Prior to that, they were quite good. Optus has been steadily improving in Bendigo, and are quite good now. 73 de VK3JED / VK3IRL http://vkradio.com

4 4

Re: Change default program
by Jeremy Visser 12 Jul '12

12 Jul '12

On 12/07/12 12:11, Trent W. Buck wrote: > Also I presume you can put .desktop files in a per-user directory, > probably something like ~/.applications, but I don't know exactly > where. ~/.local/share/applications > PS: all of the above applies to GNOME 2. I have no experience with > GNOME 3 but I would be suprised if they haven't thrown all of the > above out to replace it with something differently bad. Hasn't changed at all to my knowledge.

1 0

Linux powered drone @ 5pm folllowed by pre-meeting dinner @ Korean
by Chris Samuel 12 Jul '12

12 Jul '12

Hi folks, I've got a Linux powered quadcopter (an ARDrone 2.0) which I'm going to take over to the north end of University Square (between Barry St and Leicester St, and south of Grattan St in Carlton) at 5pm this evening if anyone is interested in seeing it fly (weather permitting). The battery doesn't last that long (about 10 minutes) so if you're interested don't be late. :-) After that I'll head down to Big Mama's Korean Restaurant on Swanston St for dinner before the LUV meeting (I live too far out to go to the after-meeting meal at Marias). cheers! Chris -- Chris Samuel : http://www.csamuel.org/ : Melbourne, VIC

6 9

system not halting
by Russell Coker 12 Jul '12

12 Jul '12

When you have a system which logs the following but doesn't halt, what should you investigate? Will now halt. [ 123.456789] System halted. -- My Main Blog http://etbe.coker.com.au/ My Documents Blog http://doc.coker.com.au/

2 1