excentral

Moar RAID Win

Matthew Schick — Mon, 01 Mar 2010 01:31:22 +0000

Had to upgrade my storage over the past week and decided to see just how good Linux software raid (mdadm) and SATA hot plugging were these days. The current setup was a five disk array with two 1TB and three 750GB drives attached to an ASUS M3A76-CM motherboard in AHCI mode. My first issue was that all five drives were attached internally so access would require mucking about in the case to replace the three disks so I dug around and ended up purchasing a Supermicro CSE-M35T-1B so I would be able to swap the disks out easily.

After getting the original drives shifted into the new rack, it was as easy as 1-2-3(ish) to replace the drives (with the filesystem live):

mdadm /dev/md1 --fail $PARTITION --remove $PARTITION
Replace disk, create partition
mdadm /dev/md1 --add $PARTITION, resync

Each resync after the replacement took 3-4 hrs and the fan in the rack kept the disks no warmer than 32C. After the final disk was done and synced, I expanded the array to include the new space:
mdadm --grow /dev/md1 --size=max
Then let lvm know the new space was usable:
pvresize /dev/md1
And ran vgdisplay to see my extra ~940GB.

Gawd it’s nice when stuff Just Works.

Enabling suspend/resume with XBMC in Ubuntu 9.10

Matthew Schick — Sun, 08 Nov 2009 21:05:54 +0000

Had issues after upgrading to Karmic with suspend/resume on my media box (Shuttle SN78S) where the system would suspend and then immediately resume (xbmc forum thread). After ruling out the nvidia blob as the culprit (my usual suspect), I did a bit more digging and found people able to make it work by disabling usb autosuspend but that didn’t make a difference at all for me. I did find some older documentation pointing to an oddity with the ehci driver and acpi wakeup causing this issue so I disabled it (via /proc/acpi/wakeup) and was able to suspend successfully. Wakeup via WOL succeeded as well, but not being able to resume via remote is a showstopper for me so I poked a bit more and enabled wakeup only for the USB device my remote sensor was attached to and voila!

To determine the USB device:
root@host:~#lsusb Bus 003 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub Bus 004 Device 002: ID 1784:0008 TopSeed Technology Corp. Bus 004 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
In this case it’s easy as my remote sensor is the only device attached and it’s on bus 004.

root@host:~#cat /proc/acpi/wakeup |grep ^USB USB0 S3 disabled pci:0000:00:02.0 USB1 S3 enabled pci:0000:00:04.0 USBB S3 disabled pci:0000:00:04.1 USB2 S3 disabled pci:0000:00:02.1
Now I have both the USB1 and USBB devices that show up on 04, but USB1 is the first so that was the one I enabled via:
echo "USB1" > /proc/acpi/wakeup

To make it persistent I added the following to /etc/rc.local (the ethtool command enables WOL and isn’t needed unless you want to wake your machine over the network):
# Enable wakeup for the remote status=`cat /proc/acpi/wakeup | grep "USB1" | awk {'print $3}'` if [ "$status" = "disabled" ]; then echo "USB1" > /proc/acpi/wakeup fi

/usr/sbin/ethtool -s eth0 wol g > /dev/null

The only other step I took was to work around the standard lirc borkage by disabling lirc and unloading the modules. This requires two files:
/etc/pm/config.d/01lirc_module
SUSPEND_MODULES="lirc_mceusb lirc_dev"

/etc/pm/sleep.d/10-lirc (must be executable, requires installing curl – apt-get install curl)
#!/bin/sh # Disconnect XBMC from lirc and stop the daemon

case "$1" in hibernate|suspend) service lirc stop ;; thaw|resume) service lirc start ;; *) exit $NA ;; esac

As of 9.11 alpha 2, XBMC uses ConsoleKit in the Karmic packages so you need to make sure your session gets auth’d properly or you’ll end up with permission denied messages in the xbmc logs when it tries to suspend. If you’re using GDM or KDM it should Just Work. In my case I’m just starting x on tty1 for my xbmc user so I had to update my .xsession file to launch xbmc like so:
ck-launch-session /usr/bin/xbmc --standalone

Edit: As of 9.11 alpha2, XBMC takes care of connecting/disconnecting from the LIRC daemon so no need to do it in the lirc script. Also added info about the new ConsoleKit integration in alpha2.

Ultimate Phone

Matthew Schick — Thu, 16 Jul 2009 02:44:31 +0000

Must have, can’t live without, omg, do wnat!

edit: updated the link so it actually works… thanks Vadim!

Four weeks

Matthew Schick — Sat, 06 Jun 2009 14:36:46 +0000

That’s how long it’s been since I began this experiment with electronic cigarettes. Haven’t touched a regular cig since then, haven’t missed em and won’t go back to em.

Hooray for no more tar, ashtray stank and smoke wheeze!

Two weeks

Matthew Schick — Sat, 23 May 2009 15:51:56 +0000

That’s how long it’s been since I had an ‘analog’ cigarette. And I’ve started running again. Life is good.

Posted by Wordmobi

From the ‘Duh!’ files

Matthew Schick — Mon, 18 May 2009 22:30:55 +0000

Had my first workout post-cigarettes and wow… Being able to breathe again makes a huge difference in the quality of the exercise (duh!). Was able to really push myself without feeling like I was going to pass out from lack of oxygen and (amazingly) felt quite good after I was done.

Been trying to become less of a couch potato for years now and I guess I underestimated the effects of cigs. Really not very bright on my part eh…

One week…

Matthew Schick — Sun, 17 May 2009 00:04:56 +0000

… and not a single ‘analog’ cigarette. Rock!

eCigs FTW!

Matthew Schick — Wed, 13 May 2009 00:41:38 +0000

So my new tasty ‘juice’ came in today and I’m 100% hooked. The flavor is worlds above the pre-filled carts I got with my 901 and it’s much, much smoother.

I haven’t had a cigarette now since the evening of the 8th, and I haven’t missed em in the least. My chest has cleared up significantly already, my energy levels are up and I can take deep breaths without a ‘catch’ again. Sure, I still have the nicotine monkey on my back, but losing the tar and other misc chemicals has been a huge win. I’ve also been able to deal with the daily stresses of my job without the normal withdrawal issues, matter of fact it’s been a bit easier since I can just reach over and take a puff during those long phone meetings.

Another smoke-free day

Matthew Schick — Sun, 10 May 2009 18:36:27 +0000

Haven’t smoked a regular cig since Friday evening and I feel great. Yesterday I did experience some restlessness but I’m chalking that up to the lack of the other chemicals in cigs. It could also be as simple as learning to use the eCig…

Either way, I’m feeling much better today and zero withdrawl feelings. So far so good.

Faux Cigs

Matthew Schick — Sat, 09 May 2009 15:12:47 +0000

So, been aware of the so-called ‘eCig‘ for a little while now but finally was able to try one a friend has at work. My starter kit and a few extras came in yesterday evening and so far I’m impressed. It’s taking care of my cravings which is more than I can say about any of the other options I’ve tried, my lungs are already feeling better and I’m not 24 hrs into this experiment. I think I’ll actually try and update the status of this little experiment in case someone else out there is on the fence about it as well…