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interesting article on RAID
by Chuck Anderson March 12, 2010

March 12, 2010

Triple-Parity RAID and Beyond by Adam Leventhal | December 17, 2009 http://queue.acm.org/detail.cfm?id=1670144 As hard-drive capacities continue to outpace their throughput, the time has come for a new level of RAID. -- - Chuck (372 Days until IPv4 depletion: http://ipv4depletion.com/)

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Meeting: BtrFS: Now (Thurs March 11 7pm)
by Chuck Anderson March 12, 2010

March 12, 2010

Frank is giving a talk on BtrFS right now. It seems the website wasn't updated (but is now). -- - Chuck (372 Days until IPv4 depletion: http://ipv4depletion.com/) On Mon, Feb 22, 2010 at 06:18:44AM -0500, Frank Sweetser wrote: > I've noticed that not too many people have putting in meeting topic requests, > so I thought that if anyone's interested I'd volunteer to throw together some > slides on BtrFS. > > For those of you who haven't heard of it, BtrFS is the next generation linux > filesystem. Though still in heavy development, it was included in the > mainstream kernel last year. It promises to scale to filesystems well beyond > what any of the current offerings can handle (including ext4), as well as > offering far greater flexibility and better data security for data admins. > > If you have anything else that you'd like to hear about, either instead of or > in addition to BtrFS, chime in, and hopefully someone else on the list will be > able to make it happen! > > -- > Frank Sweetser fs at wpi.edu | For every problem, there is a solution that > WPI Senior Network Engineer | is simple, elegant, and wrong. - HL Mencken > GPG fingerprint = 6174 1257 129E 0D21 D8D4 E8A3 8E39 29E3 E2E8 8CEC

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Re: [Wlug] Meeting topics
by Jeff Moyer March 2, 2010

March 2, 2010

Frank Sweetser <fs(a)WPI.EDU> writes: > I've noticed that not too many people have putting in meeting topic requests, > so I thought that if anyone's interested I'd volunteer to throw together some > slides on BtrFS. > > For those of you who haven't heard of it, BtrFS is the next generation linux > filesystem. Though still in heavy development, it was included in the > mainstream kernel last year. It promises to scale to filesystems well beyond > what any of the current offerings can handle (including ext4), as well as > offering far greater flexibility and better data security for data admins. > > If you have anything else that you'd like to hear about, either instead of or > in addition to BtrFS, chime in, and hopefully someone else on the list will be > able to make it happen! If anyone is interested in a talk on SSDs, chime in. I can present my experiences with these devices. I've evaluated the performance of several vendors' products, ranging from the poor to the exemplary. I can talk about the modifications made in the block layer to accommodate for these devices, and the current implementation of the block discard support (which maps to ATA TRIM, which is important for device lognevity and performance) and how that is wired up to file systems such as ext4. Cheers, Jeff

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vmbuilder - Ubuntu Lucid?
by John Stoffel March 1, 2010

March 1, 2010

Hi, Anyone else using vmbuilder with Ubuntu's 10.x Lucid Lynx (Alpha3, I know) and cursing the change in options that just happened recently? I've been playing around building VMs (based on Karmic) and tossing them away since it was so quick. Now that I've upgrade to a newer version of Lucid, it's all busted. Sigh... This would be a good talk too, about building and using VMs. Here's the script I whipped up to help automate things, which is now busted. Sigh... I realize I need to just look in the docs, but they a) suck and b) aren't easily found. Nor is any list of changes in the options listed nicely either. Grrr!!!! THanks, John #!/bin/sh # My own script for building and starting VMs more easily, based on # the instructions given at: # # http://www.howtoforge.com/virtualization-with-kvm-on-ubuntu-9.10 # # Version 0.1 - 12/29/2009 # if [ $# -ne 3 ]; then echo "Usage: $0 hostname ip username" echo " IP is last octet of the 192.168.1/24 subnet" echo exit fi euid=`id -u` if [ $euid -ne 0 ]; then echo "Error! Script must run with root privs. Try sudo $0 ...." echo exit fi hostname=$1 ip=$2 username=$3 vmbase="/var/vm" subnet="192.168.1" suite="karmic" bridge="br0" mem=256 mirror="http://192.168.1.3:9999/ubuntu" # LVM stuff volgroup="virtmachs" #--------------------------------------------------------------------- # Make the directory where we store the VM config #--------------------------------------------------------------------- if [ -d ${vmbase}/${hostname} ]; then /bin/rm -rf ${vmbase}/${hostname} fi mkdir -p ${vmbase}/${hostname} cd ${vmbase}/${hostname} #--------------------------------------------------------------------- # Copy over the template, but use the fixed one instead in vm0 #--------------------------------------------------------------------- mkdir -p ${vmbase}/${hostname}/mytemplates/libvirt cp ${vmbase}/vm0/mytemplates/libvirt/* ${vmbase}/${hostname}/mytemplates/libvirt/ #--------------------------------------------------------------------- # Setup partitions file #--------------------------------------------------------------------- cat >vmbuilder.partition <<EOF root 8000 swap 2000 /var 10000 EOF #--------------------------------------------------------------------- # Setup the boot.sh file #--------------------------------------------------------------------- cat >boot.sh <<EOF # This script will run the first time the virtual machine boots # It is run as root. # Expire the user account /usr/bin/passwd -e ${username} # Set the root password /usr/sbin/usermod -p '$1$MbDcN3NU$ndC6TvQ1.a1VG0jbeW3hD.' root # Install openssh-server apt-get update apt-get install -qqy --force-yes openssh-server nfs-client nfs-common mkdir /local /staging /home echo "jfsnew:/home /home nfs soft,sec=sys,vers=3,tcp,rsize=32768,wsize=32768,nolock 0 0" >> /etc/fstab echo "jfsnew:/local /local nfs soft,sec=sys,vers=3,tcp,rsize=32768,wsize=32768,nolock 0 0" >> /etc/fstab echo "jfsnew:/staging /staging nfs soft,sec=sys,vers=3,tcp,rsize=32768,wsize=32768,nolock 0 0" >> /etc/fstab mount /home mount /local mount /staging echo "America/New_York" > /etc/timezone cp /usr/share/zoneinfo/America/New_York /etc/localtime EOF #--------------------------------------------------------------------- # Create LVM volume for VM #--------------------------------------------------------------------- if [ ! -e /dev/${volgroup}/${hostname} ] then lvcreate -L20G -n ${hostname} ${volgroup} else echo echo "Skipping lvcreate, Logical Volume ${hostname} already exists." echo fi #--------------------------------------------------------------------- # Run vmbuilder #--------------------------------------------------------------------- echo vmbuilder kvm ubuntu --suite=${suite} --flavour=virtual --arch=amd64 --mirror=${mirror} -o --libvirt=qemu:///system --tmpfs=- --ip="${subnet}.${ip}" --part=vmbuilder.partition --templates=mytemplates --user=${username} --name=${username} --pass=${username} --addpkg=vim-nox --addpkg=unattended-upgrades --addpkg=acpid --raw=/dev/virtmachs/${hostname} --firstboot=boot.sh --mem=${mem} --hostname=${hostname} --bridge=${bridge} vmbuilder kvm ubuntu --suite=${suite} --flavour=virtual --arch=amd64 --mirror=${mirror} -o --libvirt=qemu:///system --tmpfs=- --ip="${subnet}.${ip}" --gateway="${subnet}.254" --part=vmbuilder.partition --templates=mytemplates --user=${username} --name=${username} --pass=${username} --addpkg=vim-nox --addpkg=unattended-upgrades --addpkg=acpid --raw=/dev/virtmachs/${hostname} --firstboot=boot.sh --mem=${mem} --hostname=${hostname} --bridge=${bridge} #--------------------------------------------------------------------- # Startup the VM #--------------------------------------------------------------------- if [ -e /etc/libvirt/qemu/${hostname}.xml ] then virsh define /etc/libvirt/qemu/${hostname}.xml virsh start ${hostname} else echo "Error! VM ${hostname} not created properly." echo exit fi

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How do I change the UUID on an NTFS partition?
by Randy Cole Feb. 24, 2010

Feb. 24, 2010

I've done this before but I can't remember how. Gparted (actually ntfsclone) duplicates the UUID, so I cannot mount them both!

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Job openings: web developer, application support specialist
by Brian Conway Feb. 23, 2010

Feb. 23, 2010

Hi folks. My company is looking for a couple people for openings. Background: We're a two year-old startup located in Worcester that produces a high-performance, bidirectional messaging infrastructure that encompasses voice, SMS, email, IM, social networking, and more. Current customers include a number of restaurant chains, sports venues, and state agencies. The positions are full-time with health benefits. Pay has some flexibility, but geared towards entry level and recent grads. Web developer: PHP, Ajax, SQL (Oracle), XML, Linux (of course). Additional responsibility/salary is available for partial system operations support. Customer support/application specialist: Customer-facing, non-programmer, will become an expert in our applications. Responsible for initial setup and configuration of new customers in our applications and troubleshooting. Additional roles as they appear. Let me know if anyone's interested and I'll pass it along, thanks. Brian Conway

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Re: [Wlug] Meeting topics
by Keith Wright Feb. 22, 2010

Feb. 22, 2010

> From: Frank Sweetser <fs(a)WPI.EDU> > > (I guess this mean I have to actually finish up the slides now...) To quote my boss: no need to hurry, just start it now... and finish before you go home. -- Keith

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Re: [Wlug] Meeting topics
by Andy Stewart Feb. 22, 2010

Feb. 22, 2010

-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Frank Sweetser wrote: > I've noticed that not too many people have putting in meeting topic requests, > so I thought that if anyone's interested I'd volunteer to throw together some > slides on BtrFS. > > For those of you who haven't heard of it, BtrFS is the next generation linux > filesystem. Though still in heavy development, it was included in the > mainstream kernel last year. It promises to scale to filesystems well beyond > what any of the current offerings can handle (including ext4), as well as > offering far greater flexibility and better data security for data admins. > > If you have anything else that you'd like to hear about, either instead of or > in addition to BtrFS, chime in, and hopefully someone else on the list will be > able to make it happen! > HI Frank, I think that would be a great topic for our next meeting. Shall I update the website accordingly? Thanks, Andy - -- Andy Stewart (KB1OIQ) Founder: Worcester Linux Users' Group Founder: Chelmsford Linux Meetup Group President: PART of Westford, MA (WB1GOF) -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.2 (GNU/Linux) Comment: Using GnuPG with SUSE - http://enigmail.mozdev.org iD8DBQFLgmywOjiraCaOTOoRAr1XAJ4nxnSQ6wNgYIrpCSt65wTVtP6ycwCgh9cQ VCClnkd/TnnJcBrSmkX6weM= =+Tco -----END PGP SIGNATURE-----

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Meeting topics
by Frank Sweetser Feb. 22, 2010

Feb. 22, 2010

I've noticed that not too many people have putting in meeting topic requests, so I thought that if anyone's interested I'd volunteer to throw together some slides on BtrFS. For those of you who haven't heard of it, BtrFS is the next generation linux filesystem. Though still in heavy development, it was included in the mainstream kernel last year. It promises to scale to filesystems well beyond what any of the current offerings can handle (including ext4), as well as offering far greater flexibility and better data security for data admins. If you have anything else that you'd like to hear about, either instead of or in addition to BtrFS, chime in, and hopefully someone else on the list will be able to make it happen! -- Frank Sweetser fs at wpi.edu | For every problem, there is a solution that WPI Senior Network Engineer | is simple, elegant, and wrong. - HL Mencken GPG fingerprint = 6174 1257 129E 0D21 D8D4 E8A3 8E39 29E3 E2E8 8CEC

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[OT]Seeing SCSI devices in Solaris
by Chuck Noyes Feb. 14, 2010

Feb. 14, 2010

Hi All, This may a bit [OT], but ... At work we have several Sparc servers running Solaris 10u8 that are connected to storage arrays via fiber cables and switches. Some of these hosts can have thousands of connections and can take hours to boot! Does anyone know a way to view the scsi connections in Solaris? In RedHat, I can do a cat /proc/scsi/scsi and see the connections. How can I do this in Solaris? devfsadm doesn't seem to give me what I want, and Google doesn't provide too much help. TIA, -Chuck

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