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Re: [GTALUG] On the subject of backups.
by lsorense＠csclub.uwaterloo.ca 06 May '20

06 May '20

On Mon, May 04, 2020 at 04:38:28PM +0200, ac via talk wrote: > Hi Alvin, > > On a 2TB dataset, with +-600k files, I have piped tree to less with > limited joy, it took a few hours and at least I could search for > what I was looking for... - 15TB and 100M is another animal though > and as disk i/o will be your bottleneck, anything will take long, no? > > now, for my own info/interest, can you tell me which fs is used for this > ext3? Hmm, sounds awful slow. Just for fun I ran find on one of my drives: # time find /data | wc -l 1825463 real 3m57s.208s That is with 5.3T used out of 6.0TB. Running it a second time when it is cached takes 7.7s. Tree takes 14.7s. Another volume: # time find /mythdata | wc -l 54972 real 0m1.924s That is with 15 TB out of 15 TB in use (yes that one always fills up for some reason). Both of those are lvm volumes with ext4 on top of software raid6 using 5400rpm WD red drives. Seems either XFS is unbelievable bad, or there isn't enough ram to cache the filesystem metadata if you are having a problem with 100M files. I only have a measly 32GB in my home machine. -- Len Sorensen

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BSDCan session on "homelabs" tomorrow (May 5)
by Christopher Browne 05 May '20

05 May '20

The "homelabs" concept is about having your own lab infrastructure, well, at home :-) https://www.reddit.com/r/homelab/ The Reddit "wiki" https://www.reddit.com/r/homelab/wiki/index has a lot of interesting material on this... (From twitter) Reminder: The live recording of my @BSDCan <https://twitter.com/BSDCan> Panel on Homelabs is tomorrow at 2pm Eastern (18:00 UTC) https:// live.freebsd.org/BSDCan/homelab/ <https://t.co/I4KjyaP0pF?amp=1> Please join the chatroom and ask your questions. They'll certainly have a BSD-flavoured conversation, so it wouldn't do to be a jerk and try to refocus on Linux, but I'm sure lots of what is discussed by the panel will involve things like hardware and software choices that aren't the OS. -- When confronted by a difficult problem, solve it by reducing it to the question, "How would the Lone Ranger handle this?"

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Re: [GTALUG] On the subject of backups.
by Alvin Starr 04 May '20

04 May '20

I am not quite sure where the breaking point is but I think part of the problem is that the directories start to get big. The directory hierarchy is only 5 to 10 nodes deep. Its running on xfs. On 5/4/20 10:38 AM, ac wrote: > Hi Alvin, > > On a 2TB dataset, with +-600k files, I have piped tree to less with > limited joy, it took a few hours and at least I could search for > what I was looking for... - 15TB and 100M is another animal though > and as disk i/o will be your bottleneck, anything will take long, no? > > now, for my own info/interest, can you tell me which fs is used for this > ext3? > > On Mon, 4 May 2020 09:55:51 -0400 > Alvin Starr via talk <talk(a)gtalug.org> wrote: >> I am hoping someone has seen this kind of problem before and knows of >> a solution. >> I have a client who has file systems filled with lots of small files >> on the orders of hundreds of millions of files. >> Running something like a find on filesystem takes the better part of >> a week so any kind of directory walking backup tool will take even >> longer to run. >> The actual data-size for 100M files is on the order of 15TB so there >> is a lot of data to backup but the data only increases on the order >> of tens to hundreds of MB a day. >> >> >> Even things like xfsdump take a long time. >> For example I tried xfsdump on a 50M file set and it took over 2 days >> to complete. >> >> The only thing that seems to be workable is Veeam. >> It will run an incremental volume snapshot in a few hours a night but >> I dislike adding proprietary kernel modules into the systems. >> >> -- Alvin Starr || land: (647)478-6285 Netvel Inc. || Cell: (416)806-0133 alvin(a)netvel.net ||

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Ubuntu update 19.10 -> 20.04?
by D. Hugh Redelmeier 03 May '20

03 May '20

I have an Ubuntu 19.10 system (I'm typing on it now). I want to upgrade it to 20.04 (released over a week ago). $ sudo do-release-upgrade Checking for a new Ubuntu release No new release found. The Ubuntu Software's GUI Software Updater also sees nothing. A Quick look at the /etc/apt/sources.list suggests that I'm using ca.archive.ubuntu.com. Does anyone know why I don't see 20.04? Odd observation: Software Update said that there were no updates. But as I typed this message, with no button pushing by me, has changed its mind and decided that there is now an Nvidia driver settings update.

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Acer Aspire 3 A315-21 laptop has mono sound only?
by Ken Heard 03 May '20

03 May '20

I think that this particular laptop has mono sound. I have been using it temporarily to stream content by HDMI to a LG HD monitor and then by fibre optical cable to a NED D3020 V2 hybrid amplifier and finally to a pair of bass reflect speakers. Unfortunately sound comes out of only one speaker. After extensive tests I have determined to my satisfaction that the problem is in the laptop. I can test the two speakers built in the laptop separately, but I have no way of knowing whether the sound so produced is mono or stereo. I could find no specs for this laptop with details about the sound card. Lack of such specs indicates to me that Acer does not want people to know that this laptop is mono only. Is mono sound the norm for low market laptops such as this one and notebooks? Ken Heard

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Re: [GTALUG] Problem new virtual host
by D. Hugh Redelmeier 03 May '20

03 May '20

| From: ac via talk <talk(a)gtalug.org> | On Fri, 1 May 2020 11:33:53 -0400 (EDT) | "D. Hugh Redelmeier via talk" <talk(a)gtalug.org> wrote: | > I'm a bit confused. But I'm probably not the only one. | > Note: I've never set up a virtual host so I could be way off-base. | > | this entire thread is confusing. it was about something unclear to | start with | and now it is simply just becoming noise. Sorry, Stephen asked for help. Something was confused or it all would have worked for him. I was trying to help reduce that confusion. Why do you consider this noise? | i mean could the op not configure apache properly? did the op not | register a domain name? is the op's /etc/hosts file being ignored due | to "browser" control of dns? Ask him. Not me. I'm trying to ask questions to clarify. | > By default, I've heard that Firefox has switched to using DNS over | > HTTPS. If your browsers have done so, they might well be ignoring | > /etc/hosts. | > | this is interesting... imnsho, life is all about balance. Not in this case. It's about how his resolvers are working or not working or not working as he expects. | > | Entering my local IP in a browser gets me to Gerbera's control | > panel. | > | > Now we know that you're running Gerbera on your server. | > | > I don't know how Apache picked Gerbera as the default. But you | > probably don't care anyway. Or maybe you should change the server's | > setup so it defaults into something innocuous. | | it also tells us, on a balance of probability, that the problem is | probably not routing/port related but Apache that does not know what it | has to serve... - so either non registered domain or /etc/hosts So say so to him, not me. And in a way that he's likely to understand and even act upon. Maybe he's already figured it out his problem but he hasn't told us.

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Problem new virtual host
by Stephen 02 May '20

02 May '20

I posted this to the Apache list but someone here may be able to help: I have a standard LAMP for development. I set up a new virtual host about once every two years and always struggle. I have added the web site to my hosts file and direct to my server. I have a dozen entries. I have updated my virtual hosts Apache file I can ping the new virtual host just fine. But both Brave and Firefox raise an error saying that the host cannot be reached? Firefox: Unable to connect Firefox can’t establish a connection to the server at roissystudiotest.ca. Brave: This site can’t be reached www.roissystudiotest.ca refused to connect. I was getting the Apache default page but corrected the file permissions to 755. Any and all help welcome! -- Stephen www.roissy.ca -- Stephen

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Laptop recommendations?
by Gron Arthur 01 May '20

01 May '20

Need to buy a new laptop, any recommendations? Any good outlets that deliver?

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ftrace-time support in Clang
by Nicholas Krause 30 Apr '20

30 Apr '20

Greetings, This seems to be a rather not know option on the LLVM side and it seems GCC does not support it. https://www.phoronix.com/scan.php?page=news_item&px=LLVM-Clang-9.0-Time-Tra… Its now in mainline as the articles like this one were mostly written before it was merged in clang/llvm version 9. 10 was just released so its now in the mainline. Maybe it interests some people here who build large software products or use embedded build systems, Nick

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Re: [GTALUG] CIRA officially launches free DNS firewall for consumers | IT World Canada News
by Alvin Starr 28 Apr '20

28 Apr '20

On 4/28/20 9:16 AM, ac wrote: > On Tue, 28 Apr 2020 08:13:11 -0400 > Alvin Starr <alvin(a)netvel.net> wrote: > <snip so many cool things around here somewhere> >> How about DNS over TOR? >> > as usual, LOVE the way you think :) > > How about just plain old DNSSEC? > (instead of a nanny) - yay, IT Works! - and is so mature > already...(without all the risks of having/using a nanny) I thought DNSSEC was more to secure the content of the query and not the communication channel. But I my DNSSEC knowledge is spotty at best. > > and using connectivity providers (instead of third parties and dns over > https) -- for caching/recursive, like Bell (Bell CA actually does not > track/record/monetise their users DNS querries afaik) All the Canadian carriers will always work to maximize their profit because they are obligated to by their shareholders. So always assume they are monetizing anything they can even in the face of public denials. They all perform deep packet inspection so assume anything the is in the clear will be monetized. I am not saying they are evil. Its just that their profit motive may not be in the end users best interest. > > Problems all solved? > >>> my further opinions are that any "nanny" type "free" service where >>> someone else decides what and where i may or may not go or what i >>> may or may not see, needs to be either well >>> regulated/controlled/open/published/etc or simply not be >>> accepted... >> Sometimes nannies are good things. > yes, nannies are 'sometimes' good things, but for some people BAD > nannies are sometimes even better :) Are you thinking of the Nanny from Queen's Fat Bottomed Girls? > >> People without the wherewithal or interest in managing their own >> security likely are in need of a nanny. >> > again, dnssec already protects users, it just needs wider adoption, > which is the issue.. .as for "shared" domains like outlook.com - abuse > management costs will increase? - which is probably why dnssec has > never caught on, it is not "sexy" (like some nannies...) > I have had mixed luck with DNSSEC from the point of view of internal implementation and have fallen back to SEC-less. As a side story. DNS(bind) has been SO reliable over the years that people have not upgraded their software. A month or so ago a few customers had their DNS partly break because the old DNSSEC root keys were removed. The solution was to turn off DNSSEC till they were able to upgrade the software. >>> anyway, i am probably a minority as i also do not like/use/support >>> very popular and world dominating services such as 'whatsapp' and i >>> do not tweet or post photos of my food on insta and i have zero >>> tiktok vids >> I have a feeling your take is not a minority on this list. > ooh, warm & fuzzies to you too, I have a home *sigh* :) > Ya. Safe at home some times feels like locked in trying to avoid the zombie apocalypse. -- Alvin Starr || land: (647)478-6285 Netvel Inc. || Cell: (416)806-0133 alvin(a)netvel.net ||

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