- luv-main - luv.asn.au

Re: Looking at RAID
by Russell Coker 07 Mar '18

07 Mar '18

On Tuesday, 6 March 2018 6:29:11 PM AEDT Craig Sanders via luv-main wrote: > On Mon, Mar 05, 2018 at 10:54:10PM +1100, Andrew Pam wrote: > > [ ... ] it's also possible to set up mirroring using LVM, btrfs or ZFS > > if you prefer. > > With btrfs or ZFS it's easy to add additional drives for more space later. With ZFS you only add them one RAID set at a time and after adding that RAID set can't be changed. You can't just add a disk at a time as you do with BTRFS. Last time I checked BTRFS RAID-5 and RAID-6 wasn't reliable IMHO. > Also, both btrfs and ZFS support transparent compression - which can > greatly increase effective capacity if most of your data is uncomressed or > poorly-compressed. Not video or audio files, for example. The last time I ran a medium size mail server on ZFS I didn't see a lot of compression. I think it was something like 40%. Usually large amounts of data means video files though. > There are so many other benefits to using either btrfs or ZFS (snapshots, > error-detection and correction, sub-volumes aka datasets, and much more), > that IMO there's little reason to use a plain RAID-1 + ext4 partition for > anything except a separate /boot. Particularly as the most common errors are silent corruption which can't be detected by a plan RAID and can only be stopped by BTRFS or ZFS. Sucks for people who don't use Unix. > ZFS has the advantage of more features, and greater reliability. It's not > built in to the kernel, but most distros have the kernel module packaged as > a dkms package (ubuntu and a few others take the legally dubious stance > that the CDDL vs GPL license conflict isn't a problem, so include ZFS > pre-compiled with their kernels already). I don't think it's legally dubious. Oracle know exactly what they are doing, if Oracle thought it was bad they would have let them know. -- My Main Blog http://etbe.coker.com.au/ My Documents Blog http://doc.coker.com.au/

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Re: Looking at RAID
by Russell Coker 06 Mar '18

06 Mar '18

On Tuesday, 6 March 2018 10:52:35 PM AEDT Andrew Greig via luv-main wrote: > Sorry about that digression. So is there a platform that handles RAID > really well? I went to OpenSuse for mapping. But now photography is my > main work, so maybe I should be looking at installing the distro which > is preferrred by developers of the GIMP and also Darktable. If you want to have root on a ZFS RAID then Ubuntu is likely to be the best option. But I recommend not doing that, it's more pain than you want IMHO. > I just can't afford to fiddle for two weeks to get a result. And the > OpenSuse and Ubuntu fora have freaked me out, somewhat. Setup a mdadm RAID-1 for /boot (and root in the case of ZFS) and then use ZFS or BTRFS for the rest. -- My Main Blog http://etbe.coker.com.au/ My Documents Blog http://doc.coker.com.au/

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Hack evening
by Russell Coker 06 Mar '18

06 Mar '18

I'm running a FOSS hack evening tomorrow. Email me off list if you are interested in attending. -- Sent from my Huawei Mate 9 with K-9 Mail.

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Looking at RAID
by Andrew Greig 06 Mar '18

06 Mar '18

Hi all, My desktop computer hard drive is now full. I have offloaded a couple of hundred Gb to an external expansion drive to give me breathing space. So I am looking at keeping sda and if possible adding sdb and sdc as a RAID arrangement, from my reading I am leaning toward a software RAID 1 (mirrored drive) using SATA drives. I am progressing further along my intended path of returning to professional photography so data security is now imperative. Can I keep sda as my boot disk and just run sdb and sdc for data storage? sda is 1Tb and sdb and sdc are identical Seagate SATA drives of 2Tb each. I run OpenSuse Tumbleweed. I was intending to get an SSD of 500Gb for my post production work with output being stored only on RAID. Am I on the right track here or do I have incorrect expectations? Many thanks Andrew Greig

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Using a Raspberry Pi in Education (Teaching)
by Said, Joseph J 01 Mar '18

01 Mar '18

Dear List Is anybody using a Raspberry Pi for teaching coding, hardware or any other application in a school? I have been asked to investigate the possibility. Thanks in advance. Joe Joe Said VCE IT / Mathematics / Science Teacher Assistant Daily Organiser Rosehill Secondary College IMPORTANT - This email and any attachments may be confidential. If received in error, please contact us and delete all copies. Before opening or using attachments check them for viruses and defects. Regardless of any loss, damage or consequence, whether caused by the negligence of the sender or not, resulting directly or indirectly from the use of any attached files our liability is limited to resupplying any affected attachments. Any representations or opinions expressed are those of the individual sender, and not necessarily those of the Department of Education and Training.

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Security OS
by Rory Geoghegan 20 Feb '18

20 Feb '18

Hey everybody, I have a friend who's having done security issues. I'm looking for an OS which is both super secure and didn't require high level skills to use. I was thinking qubez at first but after trying it out it requires quite a high level of skill to use. The main applications required are email and word. Thanks in advance Sincerely Rory Geoghegan

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Fwd: [Linux-aus] Fwd: [LACTTE] Linux Journal Community Advisory Board
by Russell Coker 16 Feb '18

16 Feb '18

---------- Forwarded Message ---------- Subject: [Linux-aus] Fwd: [LACTTE] Linux Journal Community Advisory Board Date: Thursday, 15 February 2018, 1:11:20 PM AEDT From: Linux Australia President via linux-aus <linux-aus(a)lists.linux.org.au> To: linux-aus(a)lists.linux.org.au FYI - if anyone from a LUG would like to be involved, please let me know. Best, K. -------- Forwarded Message -------- Subject: [LACTTE] Linux Journal Community Advisory Board Date: Wed, 14 Feb 2018 11:36:53 -0600 From: Mark Irgang <mark(a)linuxjournal.com> To: council(a)linux.org.au I’m writing on behalf of Linux Journal. We want your help. We have formed a Community Advisory Board and would be very interested in having one representative from your LUG sit on our board. We want to make sure the community’s voice is strong within the pages of Linux Journal. What would be required of you? Nothing formal. Our editors will communicate with the board on a monthly basis to ask for editorial suggestions and guidance. More importantly, you’ll have the ear of our editors-- the issues you discuss at your LUG meetings can be brought to the editors whenever you see fit (e.g. hot topics, news, big ideas, technical concerns, you name it). What we need from you to get started: If you’re up for this, we’d love the name and email address of one member representative from your group, as well as your group’s name and URL. We’d like permission to publish these names within the pages of our magazine and on our web site (email address naturally will stay private). We’re looking to have this board set up by the end of February. Please let me know if you’d be interested in participating. Thanks much, Mark C. Irgang Associate Publisher Linux Journal -- The Original Magazine of the Linux Community www.linuxjournal.com <http://www.linuxjournal.com> PO Box 170127 Austin, TX 78717 Phone: 713-344-1956 X111 <tel:%28713%29%20344-1956> ----------------------------------------- -- My Main Blog http://etbe.coker.com.au/ My Documents Blog http://doc.coker.com.au/

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GMail + Email Client
by Piers Rowan 01 Feb '18

01 Feb '18

Hi there! We have moved to GMail from our own servers. For good reasons I have 4 mailboxes that I use. (At least one of which receives 200 messages per hour with a rule in place to move some of the content into folders). I am using Thunderbird right now and the performance of GMail vs our Dovecot (Linux IMAP server) is sluggish. In addition mail takes longer to arrive and polling seems to cache old message lists. Given that we cannot move away from GMail is it a client issue? Is there a better client? Any feedback welcomed. Have a great day. P

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suspend resume macbook pro
by Brian May 21 Jan '18

21 Jan '18

Hello, I have installed Debian/stretch on a MacBook Pro, and it all seems OK, except suspend/resume is now suspend/crash instead. Sometimes I get a black screen, most times the screen gets restored and then it crashes. Furthermore, I was accidentally pressing the power button and shutting down the system, so changed this action to suspend. Now instead of a clean shutdown, I get a dirty crash whenever I accidentally press the power button :-| Maybe should change that to ignore for now... How do I go about debugging suspend/resume problems? Online reports seem to indicate that there should be no problems with suspend/resume and a recent kernel. Regards

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iview and flv files
by Russell Coker 16 Jan '18

16 Jan '18

Files produced by python-iview give errors like the following when I try to play them with mplayer. Anyone have suggestions for how to deal with it? The files produced last year were ok but it seems that something changed at the ABC so files downloaded this year don't work. $ mplayer IN1501H016S00MA1D1_20171216030611_650000.flv MPlayer 1.3.0 (Debian), built with gcc-7 (C) 2000-2016 MPlayer Team do_connect: could not connect to socket connect: No such file or directory Failed to open LIRC support. You will not be able to use your remote control. Playing IN1501H016S00MA1D1_20171216030611_650000.flv. libavformat version 57.83.100 (external) libavformat file format detected. LAVF_header: av_find_stream_info() failed LAVF: no audio or video headers found - broken file? libavformat file format detected. LAVF_header: av_find_stream_info() failed LAVF: no audio or video headers found - broken file? -- My Main Blog http://etbe.coker.com.au/ My Documents Blog http://doc.coker.com.au/

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