I did it. I finally got Time Machine working over iSCSI on my OpenSolaris RAIDZ1 ZFS pool:
For the most part, I followed the instructions here:
Step #6 didn’t make sense to me (not sure what I was supposed to do), so I skipped it.
It also wasn’t quite as plug and play as the article suggests. Here’s some of the problems I had to overcome:
- My SCSI card wasn’t recognized by OpenSolaris. This Google Group thread really helped. Basically, I had to get the SUNWadp driver from a different Solaris distribution (I used SXCE). I’m still not clear about how pkgadd works with a directory, so I just copied the uncompressed driver to /var/spool/pkg then ran pfexec pkgadd. I also found (via dmesg after rebooting) that the driver is 32-bit only, so I had to remove $ISADIR from /rpool/boot/grub/menu.lst to boot in 32-bit mode. I also found out that’s not really desirable with ZFS as it favors 64-bit but it’ll have to do until I can find a newer SCSI card.
- I had my ZPOOL created, but kept getting errors when I tried to turn on iSCSI. I then proceeded to try to install the COMSTAR iSCSI target pkg, which didn’t work. I found out it was already installed and all I needed to do was enable the service. Doh! I’m still not clear on CLI-fu on OpenSolaris, so I used the Services GUI to do this. I actually looked for the command to do it via CLI, but it seems to have changed quite a bit from release to release. I was also getting impatient and wanted results! :) The good thing is, the GUI shows you the command, so it’s a good way to learn.
That’s it! Thankfully once I had done that, I was able to connect to the target via the globalSAN iSCSI Initiator for OS X. I actually expected it not to work, but it worked without a hitch! I was able to format the ZVOL HFS+ so Time Machine could use it, and my backups began! This was much faster performance-wise than AFP on Linux, and I didn’t have to trick time machine into using it!
Things I still need to do:
- Figure out how to allocate the rest of the ZPOOL and share it via CIFS & hopefully AFP! How do I tell ZFS to use the rest of the pool? zfs create -s -V …
- Get better with Solaris/OpenSolaris CLI. Coming from Linux… it’s different.
- Find a supported SCSI card and use 64-bit.
- Figure out how to automatically mount/unmount the volume on my laptop for when I get to work or leave. The trigger should be whenever I plug in my ethernet cable, but ONLY for that location. Tricky…
- Figure out iSCSI authentication, such as CHAP.
iSCSI uses a LOT of TCP overhead, so keep that in mind if you’re doing it yourself. I have a gigabit switch in my office that all my machines hook into, so that traffic is kept off the main network. I would not try it over wireless (if that’s even possible).
The more I learn Sun, the more I’m realizing it’s not really for the “latest and greatest” technologies, but rather a rock-solid stability. OpenSolaris seems to be trying to bridge that gap, so I’m looking forward to seeing where it goes.