- Roundtable - muug.ca

Re: [RndTbl] Roundtable Digest, Vol 132, Issue 9
by Michael Doob 23 Dec '15

23 Dec '15

This exact situation has happened to me due to the following scenario: I rsync parts of my system nightly onto an external esata drive mounted in the file system. If something hiccups and the drive gets unmounted, the backup is done onto the root file system at the mount point, and then when the drive gets remounted the files on the root system are hidden in just the way just as you described you described. The script now looks at what is mounted on the file system before rsync runs. It's obvious once you see it (just like mathematics). Cheers, Michael On 15-12-23 12:00 PM, roundtable-request(a)muug.mb.ca wrote: > Send Roundtable mailing list submissions to > roundtable(a)muug.mb.ca > > To subscribe or unsubscribe via the World Wide Web, visit > http://www.muug.mb.ca/mailman/listinfo/roundtable > or, via email, send a message with subject or body 'help' to > roundtable-request(a)muug.mb.ca > > You can reach the person managing the list at > roundtable-owner(a)muug.mb.ca > > When replying, please edit your Subject line so it is more specific > than "Re: Contents of Roundtable digest..." > > > Today's Topics: > > 1. "Missing" disk space (Adam Thompson) > > > ---------------------------------------------------------------------- > > Message: 1 > Date: Tue, 22 Dec 2015 12:02:05 -0600 > From: Adam Thompson <athompson(a)avant.ca> > To: roundtable(a)muug.mb.ca > Subject: [RndTbl] "Missing" disk space > Message-ID: > <CAFGv8b9jCKjwVhRjJLWm7cSWz9GoxQ5ZYO+AE_gCRsU0rhP8Vg(a)mail.gmail.com> > Content-Type: text/plain; charset="utf-8" > > Documenting for posterity, and in case anyone else runs into the same > problem: > > > I ran into a situation today where df(1) showed me a filesystem that was > getting pretty full (109GB used out of 146GB), but when I used du(1) to > find the space hogs, it was only able to locate <30GB of data on the > partition. > > (Hint: it was the root partition.) > > The culprit turned out to be 87GB of files "hidden" underneath > mountpoints. If you create /mnt/xyz, copy files into /mnt/xyz/*, then > mount another filesystem (local or remote) at /mnt/xyz, the original files > are still there, still taking up disk space, but unavailable. > > Luckily, this was a Linux system, and I was able to get access to those > files using a rebind mount: > - mkdir /tmp/xyz" > - "mount -o rebind /dev/mapper/root_lv /tmp/xyz" > - "cd /tmp/xyz/mnt/xyz" > - "du -sh *" > ...yup, there's 87GB of files that I *don't* see under /mnt/xyz. > > It's pretty obvious that the files were intended to live on a remote > fileshare, but got copied in at a point in time when the remote filesystem > wasn't mounted. Now I'm mv(1)'ing 87GB of data back across to a Windows > server across a CIFS mount... time to go for lunch, I guess! > > [image: Avant logo] *Adam Thompson* > Senior Systems Administrator > *voice:* 204.789.9596 x24 | *email:* athompson(a)avant.ca | *web:* avant.ca >

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"Missing" disk space
by Adam Thompson 22 Dec '15

22 Dec '15

Documenting for posterity, and in case anyone else runs into the same problem: I ran into a situation today where df(1) showed me a filesystem that was getting pretty full (109GB used out of 146GB), but when I used du(1) to find the space hogs, it was only able to locate <30GB of data on the partition. (Hint: it was the root partition.) The culprit turned out to be 87GB of files "hidden" underneath mountpoints. If you create /mnt/xyz, copy files into /mnt/xyz/*, then mount another filesystem (local or remote) at /mnt/xyz, the original files are still there, still taking up disk space, but unavailable. Luckily, this was a Linux system, and I was able to get access to those files using a rebind mount: - mkdir /tmp/xyz" - "mount -o rebind /dev/mapper/root_lv /tmp/xyz" - "cd /tmp/xyz/mnt/xyz" - "du -sh *" ...yup, there's 87GB of files that I *don't* see under /mnt/xyz. It's pretty obvious that the files were intended to live on a remote fileshare, but got copied in at a point in time when the remote filesystem wasn't mounted. Now I'm mv(1)'ing 87GB of data back across to a Windows server across a CIFS mount... time to go for lunch, I guess! [image: Avant logo] *Adam Thompson* Senior Systems Administrator *voice:* 204.789.9596 x24 | *email:* athompson(a)avant.ca | *web:* avant.ca

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OpenCSW Solaris packages
by Adam Thompson 18 Dec '15

18 Dec '15

https://www.opencsw.org/

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Map of NSA spying on Canadian data
by Adam Thompson 18 Dec '15

18 Dec '15

http://www.theregister.co.uk/2015/12/17/canadian_live_route_map_shows_nsa_s… Neat... -Adam

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math puzzle with U of M solution
by Trevor Cordes 09 Dec '15

09 Dec '15

As discussed at the meeting last night. Here's a fun math problem where the solution was submitted by a U of M student to Mike 20 years ago. Not often Winnipeg gets mentioned in international press! And the solution is even more nuts than I said last night: you also have to use imaginary numbers! Linux Mag makes you pay $2.95 paypal to read the whole article (you can read the first bit free). Worth it if you're interested. I think if you wait a few months they release the article for free. http://www.linux-magazine.com/Issues/2015/179/Perl-Math-Problems

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FS: power supply lots
by Trevor Cordes 09 Dec '15

09 Dec '15

Forsale: 1999-2004 era used computer power supply lots. Seeing if anyone might have any interest, for a project, spares, parts, etc. They are older style (pre-24pin era). These are all standard form factor (PS2, fits all standard size MATX and ATX cases), 20-pin ATX connector (not the 24-pin required today). All PS's are used, most are in working condition, a few might have bad caps or dying fans (details are available). If anyone is interested I can run more thorough tests, I have a testing tool. Price would be quite inexpensive per unit, open to reasonable offers. Will separate if desired. LOT 1 (the newest): qty 7; with auxillary 4pin (2x2) square connector ("P4" connector for extra CPU power introduced in the P4 era). LOT 2: qty 20 or so; without aux 4pin; from P2/P3 era. (Also have AT power supplies if everyone ever needs any.) Email me separately, thanks!

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setting "word-chars" in gnome-terminal
by Trevor Cordes 02 Dec '15

02 Dec '15

As per a comment I made maybe a year ago at a general meeting during roundtable regarding gnome-terminal removing the ability to set your own set of "word stop characters". This annoyed me (as an admin and programmer) to no end because all of a sudden I was forced to accept that double-clicking a word would also select : and #, and some other crazy characters that aren't "word chars" to me. They finally fixed this bug earlier in the year. Fedora 22 has the fix (vte 0.28 and gnome-terminal 3.16 and newer in any OS). However, the fix does not provide a GUI way to change the chars. Furthermore, the new method is pretty confusing. I haven't seen a good explanation/documentation yet on the net, in the bugzillas or elsewhere. Here's mine: First, get your gnome-terminal (g-t) "profile id". Right-click in your g-t -> Profiles -> Profile Preferences (make sure your desired / usual profile is selected). The UUID-ish looking thing in the General tab after "Profile ID" is what you need. You can select it, and paste it below (or retype it). For ease of manipulation, we'll put that profile-id into a shell var: csh/tcsh: set z=b1dcc9dd-5262-4d8d-a863-c897e6d979b9 sh/bash/ksh: z=b1dcc9dd-5262-4d8d-a863-c897e6d979b9 Note, that string might be the same for you, that's my default profile id, and it seems to pop up in other people's comments so it may be some kind of hardcoded value for the default profile. See what your values are set to: dconf read /org/gnome/terminal/legacy/profiles:/:$z/word-char-exceptions dconf read /org/gnome/terminal/legacy/profiles:/:$z/word-chars Your word-char-exceptions may be blank, and your word-chars may be set to something if you are on a box you've upgraded from old versions. Anyhow, you'll notice word-chars is being ignored. It's obsolete. Hose it (or just ignore it, but it confused me to no end until I confirmed with a dev it was being ignored): dconf reset /org/gnome/terminal/legacy/profiles:/:$z/word-chars Now we set the word-char-exceptions we want. Here's the confusing part: this value is what we WILL consider a word-char, and so chars you put in here will be selected when you double-click. Even worse, A-Za-z0-9 seem hardcoded in there, so you don't need to specify them. The nomenclature stinks because to me what you are setting aren't "exceptions", they are actual word-chars. Perhaps it should have been named word-char-additions. Here's how you set it: dconf write /org/gnome/terminal/legacy/profiles:/:$z/word-char-exceptions '@ms "-/(a)_&.?"' If you had word-chars previously set and liked it, just remove A-Za-z0-9 from that list and put the remainder chars in the word-char-exceptions list. You must move the dash to the front, right after the double-quote, like in a regex character class. You can specify ranges (in ascii) of chars using the dash elsewhere. I have no idea what the @ms and extra quoting is for, but the dev put that in his example and it works. I'm not sure how you'll get a ' or " in the list, but I'm sure it's possible (single quote should be easy but who knows how dconf wants the double escaped). As a programmer, making either quote a word char is insanity so I leave that as an exercise for the reader. The write to dconf takes effect immediately in your running g-t's, no need to restart anything. I (strongly) assume this writes to a persistent store somewhere so you don't have to do it on each boot. The devs say they'll put the GUI option back in the preferences dialog sometime in the future. That'll be much nicer! Why it was ever removed is beyond me. Now, onto another bz as to why the --title option in g-t was removed... Big thanks to Egmont Koblinger for being (one of) the driving force behind getting this option put back in.

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ECC - 8 chips?
by Trevor Cordes 02 Dec '15

02 Dec '15

I'm doing some ECC RAM shopping on ebay (as per prev postings). I came across something weird. There's a stick showing up in various places that claims to be ECC but all pics (and the physical unit, I've confirmed) have only 8 (or 16) DRAM chips, not 9 or 18. Does this make any sense to anybody? Is this possible?? The stick is Kingston KTH-XW4400E6/2G http://www.walmart.com/ip/Kingston-KTH-XW4400E6-2G-2GB-ECC-DDR2-800-240-pin… http://www.ebay.ca/itm/221949985186? http://www.newegg.ca/Product/Product.aspx?Item=N82E16820134842 specifically says in "overview" it has "Error Checking and Correcting Technology" Kingston has discontinued this part and it's hard to even find on the site anymore, but here's: http://www.ec.kingston.com/ecom/hyperx_us/partsinfo.asp?root=&ktcpartno=KTH… says x72 ECC The equiv HP #'s they provide all show up on the net as 9 chip, so this Kingston stick should be ecc. ??? WTF?

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MUUG Meeting, Dec 8, 7:30pm -- Zenworks: The Other CM
by Gilbert E. Detillieux 01 Dec '15

01 Dec '15

The Manitoba UNIX User Group (MUUG) will be holding its next monthly meeting on Tuesday, December 8. The meeting topic for this month is as follows: Zenworks: The Other CM Heard about ZENworks but never really seen it? In this month's presentation, Katherine Scrupa will be discussing her trials and tribulations with Novell's Configuration and Systems Management suite. Learn how to control the behaviour of software bundles, which bugs and gotchas to watch out for, and discover new version features in the 11.3 version of ZCM. Round-table, Mingling and Munchies As 2015 draws to a close, MUUG is going to continue our recent tradition of turning the December meeting into more of a social event. We will have the usual round-table session, followed by a presentation, and then have some time for mingling, eating, and drinking. This will be a pot-luck snack event. Cookies and pop will be provided by MUUG, but members are encouraged to bring their own finger food to sample and share. Feel free to bring your own drink as well if you want something particular - just remember that we don't have a liquor license! Winnipeg Harvest Food Drive Also as in previous years, we are combining our pot luck with a food drive for Winnipeg Harvest. This month, any member who brings at least 1 item for Winnipeg Harvest to the December meeting will be given an entry into the door prize draw! Winnipeg Harvest has information about what they're looking for on their website: http://winnipegharvest.org/donate-food/ The group holds its general meetings at 7:30pm on the second Tuesday of every month from September to June. (There are no meetings in July and August.) Meetings are open to the general public; you don't have to be a MUUG member to attend. ****************************************************************** Please note our *NEW* meeting location for this month: *Room 1M28* Manitoba Hall, University of Winnipeg, entrance on Ellice Ave. between Spence St. and Balmoral St. Parking is available on the surrounding streets and in the lots on nearby streets. Look for signage once you're at the building, or ask a security guard. ****************************************************************** For more information about MUUG, and its monthly meetings, check out their web server: http://www.muug.mb.ca/ Help us promote this month's meeting, by putting this poster up on your workplace bulletin board or other suitable public message board: http://www.muug.mb.ca/meetings/MUUGmeeting.pdf -- Manitoba UNIX User Group E-mail: <gedetil(a)muug.mb.ca> c/o Gilbert E. Detillieux Web: http://www.muug.mb.ca/ University of Manitoba Phone: (204)474-8161 Winnipeg MB CANADA R3T 2N2 Fax: (204)474-7609

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"un-RAIDing" a Linux P2V
by Wyatt Zacharias 01 Dec '15

01 Dec '15

So I'm attempting to virtualize one of our Redhat 5 boxes using VMWare's P2V functionality, and it's copied all the data into the VM without any trouble, but now I can't seem to get the virtual machine to boot because it's not detecting the virtualized partitions correctly. The physical system was using LVM on top of dm-raid to local disks. When VMWare virtualized the disks, it created a single disk, and copied the LVM layout onto it, so I think what's happening is on boot, the system is looking for the RAID disks and can't find them. When I try to boot it, it says that it can't find the logical volumes and goes into a kernel panic. I've booted with a rescue disk, and when I run a pvscan on the new virtual disk, all the volumes are there and can be mounted, so the problem must be that the system isn't looking for the volumes in the right place. I've tried changing the root device to /dev/sda in the device.map comfig file, and I rebuilt the initrd file with both the --force-lvm-probe and --omit-raid-modules and it still loads dm-raid on boot. So how do I get the system to completely forget about RAID, and boot off the new virtual disk? Is there a RAID config somewhere that I'm missing? -- Wyatt Zacharias

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