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BTRFS errors
by Russell Coker 04 Aug '13

04 Aug '13

Aug 4 19:21:36 server kernel: [1634894.027985] btrfs read error corrected: ino 8403 off 41730048 (dev /dev/sdd1 sector 46841264) Aug 4 19:21:36 server kernel: [1634894.053482] btrfs read error corrected: ino 8403 off 47702016 (dev /dev/sdd1 sector 46852928) Above is a sample of the error log from a system with a defective SATA disk. It's the same defective SATA disk that I discussed previously in regard to ZFS errors. I believe that ZFS is deficient in that it doesn't provide similar log messages. For test purposes I created a RAID-1 array over two partitions on the same disk. To test it I'm making a backup of one of my servers because it's the backup is a reasonable amount of data and yet another backup of the server is always a good thing. It's unfortunate that btrfs seems to offer no way of getting a count of the number of errors from the filesystem that were fixed during normal operation (as opposed to errors fixed during a scrub). I'll suggest this on the mailing list. -- My Main Blog http://etbe.coker.com.au/ My Documents Blog http://doc.coker.com.au/

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Re: [MLUG] Ubuntu forums -- hacked....
by Andrew McGlashan 30 Jul '13

30 Jul '13

On 22/07/2013 6:27 AM, Andrew McGlashan wrote: > http://ubuntuforums.org/announce.html > > Part of the maintenance page below .... Just a quick update TL;DR -- still down for users, restored, being tested by admins. Progress report 2013-07-20 2011UTC: Reports of defacement 2013-07-20 2015UTC: Site taken down, this splash page put in place while investigation continues. 2013-07-21: we believe the root cause of the breach has been identified. We are currently reinstalling the forums software from scratch. No data (posts, private messages etc.) will be lost as part of this process. 2013-07-22 -> 2013-07-25: work on reinstalling the forums continues. 2013-07-26: the forums are up running again and being tested privately by Forum administrators. Cheers A.

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802.11n cards/adapters for use with Host AP mode in Linux
by Jason White 30 Jul '13

30 Jul '13

I'm thinking of purchasing either a PCI Express card or a wireless USB adapter that can be used to create an 802.11n access point under Linux using hostapd. Notoriously, products can change quickly and one has to be sure to buy a device with the right chip set. My research so far indicates that an Atheros chip would be best - they seem to be well supported and the manufacturer is (or was) helping with the Linux drivers. A USB device would be slower, of course, but more portable - just connect it to any desktop/laptop with Linux installed. Alternatively, I could install a card in my main desktop machine, which has PCI Express slots available (but no PCI slot due to another card). Can this be made to work reliably? Any product recommendations would be welcome. On the USB side, this Web page mentions some potential devices: http://forum.doozan.com/read.php?2,6300

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anyone running Jessie yet?
by James Harper 28 Jul '13

28 Jul '13

Is anyone running Debian Jessie yet? Previously I was running Wheezy with a few packages from Sid and experimental, but in the past it's taken a month or two for the new testing release to reach some form of stability. Thanks James

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external drive enclosure
by Russell Coker 27 Jul '13

27 Jul '13

I've got a Dell Poweredge tower server running RAID-Z1 on 4 internal disks. I'd like to extend it with another maybe 8 disks in a RAID-Z2 with the option of easily adding another 8 or 16 later. The system has an eSATA connector so an enclosure that provides 24*3.5" disks with a SATA interface (not SCSI because I need SMART to work) at 6Gb/s (600MB/s) will do. Does anyone know of such an enclosure that's cheap? Ideally it wouldn't be excessively noisy (although 24 disks isn't going to be that quiet) because it's not a rack-mount system. Before someone comments on the speed, this is mostly for archival and the data will be accessed over a single Gig-E connection. So I need 100MB/s data transfer out of the system (maybe 140MB/s if a USB device is being used at the same time) and the 600MB/s will only be for zpool scrub. -- My Main Blog http://etbe.coker.com.au/ My Documents Blog http://doc.coker.com.au/

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zpool status
by Russell Coker 26 Jul '13

26 Jul '13

I'm getting some errors on a zpool scrub operation. It's obvious that sdd has the problem both from the below output of zpool status and from the fact that the kernel message log has read errors about sdd. But how can I get detail about what has gone wrong? Has sdd given corrupt data in addition to read failures? Presumably the "(repairing)" string will disappear as soon as the scrub finishes, when that happens how would I determine that sdd was to blame without the kernel error log? # zpool status pool: tank state: ONLINE scan: scrub in progress since Thu Jul 25 16:38:01 2013 1.01T scanned out of 10.3T at 164M/s, 16h26m to go 1.40M repaired, 9.80% done config: NAME STATE READ WRITE CKSUM tank ONLINE 0 0 0 raidz1-0 ONLINE 0 0 0 sda ONLINE 0 0 0 sdb ONLINE 0 0 0 sdc ONLINE 0 0 0 sdd ONLINE 0 0 0 (repairing) -- My Main Blog http://etbe.coker.com.au/ My Documents Blog http://doc.coker.com.au/

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SysAdmin Day (remix)
by Tom Robinson 26 Jul '13

26 Jul '13

Happy SysAdmin Day http://sysadminday.com/

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Lightzone problem - dependency present, not detected
by Andrew Greig 26 Jul '13

26 Jul '13

Hi all, OpenSUZE 12.3 64 bit, tring to install Lightzone. what is going on here, please? linux-bczj:/home/andrew/Downloads # rpm -iv liblzma5-5.0.5-1.1.x86_64.rpmPreparing packages... package liblzma5-5.0.5-1.1.x86_64 is already installed linux-bczj:/home/andrew/Downloads # lightzone Starting LightZone version 4.0.0 ... with options : liblzma was not found on the system; exiting linux-bczj:/home/andrew/Downloads # Many thanks Andrew Greig

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[MLUG] Fear of prosecution hampers security research / or When the good guys can't do good without fear.
by Andrew McGlashan 22 Jul '13

22 Jul '13

http://www.scmagazine.com.au/News/350733,fear-of-prosecution-hampers-securi…

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Ubuntu forums hacked.
by Tim Hamilton 22 Jul '13

22 Jul '13

This comes via Andrew McGlashan & the MLUG mailing list. I thought Andrew might have cross-posted over here but it appears he hasn't and as I feel it's important to the community I thought I'd go ahead and do so. Those with a Ubuntu fourms account should see this announcement by Canonical about a security breach in which user names, email addresses and passwords stored as salted hashes were accessed. http://ubuntuforums.org/announce.html This is especially important for those people who may have reused passwords on other sites including (but obviously not limited to) Canonical's Launchpad and UbuntuOne. Cheers Tim Hamilton -- Vote NO in referenda.

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