2008/01/16

Firewall + IPMP + IPF + Zones = lost packets

Blarg!

There's no intelligence in IPF to know where to send packets when IPMP detects a link failure.

So, even though the zone will get all the packets destined for it, the global kernel will pick an interface based on its global route table, pass the packet down the wrong interface, ipf will bounce it to the FAILED interface (below the ipmp layer, apparently) and the packet is never delivered.

So I need something that will notice when an IPMP failure occurs, and rewrites the IPF rules to respond to the networking topology change. Look for my PF_ROUTE socket watcher program to be posted shortly.

--Joe

Media server v0.1a

To solve the automation problem, I'll use Linux. Since I don't have any spare computers laying around any more (I'll turn in my geek card), I've gotta set it up in a VMware instance. Luckily, VMware server is free, and I have disk space here.

Two disks... 8GB for OS, and a 32GB "data" disk to start with. Both sparsely-allocated, cuz I don't have that much disk space.

I know debian better than any other distro. So, a base install, no tasksel, update and upgrade, then installed ssh, apache2, subversion, subversion-tools, and sudo. So far I'm using 515MB. And it can't do anything yet.

Someday I'd like to switch it over to Solaris so I can run the data under zfs, but for now, I like the convenience of aptitude.

In the mean time, it's LVM I guess... I pvcreate'd /dev/sdb, vgcreated dataVG /dev/sdb, and lvcreated dataLV in it. Then mke2fs -j /dev/mapper/dataVG/dataLV and tuned it to want a fsck every 365 mounts or 730d. Mounted it as /data, and I think I'm ready to start developing.

First some data, though... I grabbed about 350MB of data from various picture CDs, copied it to /data/media/$cdname, and copied them around again to make sure there were duplicates in the data...

More to come...

2008/01/15

Getting code/screens to show up nicely

After a knowledgebase search, I found Adam Flater's blog entry http://adamflater.blogspot.com/2007/02/on-source-code.html describing a nice-looking way to do code on blogger.

I've added to my template the following style definition:
pre.code {
overflow: scroll;
}

and now I can wrap the code with <pre class="code"> and have it look nice.

Thanks, Adam!

--Joe

What's going onto the disk?

On our thumpers, `iostat -nxz 5` gives a good picture of what's happening on each of the disks, and `zpool iostat 5` gives a good overall picture of how fast things are going at the moment, but neither of these break the picture down into "Who's writing?"

A Solution:

# fsstat -T u `zfs list -H -o mountpoint -t filesystem` 5
1200435752
0 0 0 0 0 0 0 0 0 0 0 /uscisbds001
0 0 0 106 0 0 0 0 0 53 217K /uscisbds001/esx3
0 0 0 0 0 0 0 0 0 0 0 /uscisbds001/esxpatches
0 0 0 2 0 0 0 0 0 0 0 /uscisbds001/isos
0 0 0 0 0 0 0 0 0 0 0 /uscisbds001/nfs
0 0 0 0 0 0 0 0 0 0 0 /uscisbds001/saperisrv1
0 0 0 0 0 0 0 0 0 0 0 /uscisbds001/saperisrv2
0 0 0 2 0 0 0 0 0 0 0 /uscisbds001/templates
0 0 0 1.56K 0 0 0 0 0 654 15.8M /uscisbds001/temprestore


I can see that somebody's writing a buncha data to temprestore, and a little bit is happening in the esx3 directory.

--Joe

2008/01/09

Fun console error messages

For you long-time Solaris console message debuggers out there, try this one. It's an old (Solaris 8) www server. This is what's scrolling on the serial console.


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--Joe

2008/01/06

My Media project

I have had a digital camera for about 5 years now, and we've accumulated a lot of pictures from it. The biggest problem we've run into is that we have a tendency to not ever print any of the pics, nor really to organize them, or really do anything else with them. In the face of my fourth hard drive "data event", I'm looking for The Better Way to deal with the volume of digital media I'm saving.

What am I trying to do:
1. Never lose an original piece of digital media (photo, video, CD, .m4p, etc)
2. Have my digital media accessible so we can use it, in reasonable format (web-thumbnail, .mp3, etc)
3. Not keep a buncha copies of everything
4. Do it automatically as much as possible

So far what I have is about 350GB of potentially-original pictures and video on our home computer and on a set of DVDs. (m4p's are not included yet, and CDs are still on the shelf). I've got Apache sharing them out via WebDAV onto our local lan. I'd like to turn on SSL client authentication (distribute self-signed certs to our laptops) and be able to mount that drive up from any net connection. But there's a couple of minor issues (I'll talk about them later). I'm seeing the limits of my Unix-oriented thought processes when I'm running on a Windows XP Home platform.

For example, #3 above is easily accomplished -- "find . | xargs md5sum | sort" piped to a short awk script... if the md5sums match, diff the files, if they're identical, remove the second, and hardlink a second "copy" in its place. But Windows doesn't have find, xargs, sort, md5sum, awk, diff, or ln. (without cygwin)

#2 I think could be solved with a tool like Subversion... Check in the original media (take a CD for example...) titleoftrack1.wav and tag that version "primary". Then check it out, oggenc it, "svn rename .wav .ogg" and tag that version ogg-hq. Similarly, encode a mp3-hq, mp3-lq, etc. (I only have a 2GB ipod so I like 64kbps vbr mp3's there, but can afford higher-quality on my laptop or home stereo)

#1... I burn two copies of the original to DVD+R, md5sum the original (store the md5sums on the DVD too) and compare them after writing. I need 2 verified copies. One should be offsite, the other in a storage container onsite. (offsite will be implemented someday)

And that just leaves 4. How the **** do I automate all this?

--Joe