On Fri, Feb 26, 2010 at 03:45:34PM -0500, Bill Pemberton wrote: > > > > Bill, I've got a great little application that you can use to test the > > safety of the array against power failures. You'll have to pull the > > plug on the poor machine about 10 times to be sure, just let me know if > > you're interested. > > > > If the raid array works, the power failure test won't hurt any of the > > existing filesystems. If not, it's possible they will all get > > corrupted, so I wouldn't blame you for not wanting to run it. > > > > I have one of the servers idled now, so I can abuse it anyway you'd > like.
http://oss.oracle.com/~mason/barrier-test I'd run this on an ext3 partition on your raid array. You can use btrfs too, but it will give us some third party verification. mount ext3 with mount -o barrier=1 Then run barrier-test -p <70% of your system ram in MB> -s 128 -d <path to ext3> It will print some status: Memory pin ready fsyncs ready Renames ready Once you see all three ready lines, turn off power. Don't use the power button on the front of the machine, either pull the plug, use the power switch on the back of the machine, or use an external controller When the machine comes back, run fsck -f on the ext3 partition. If you get errors, things have gone horribly wrong. Ripping the power out isn't nice, if this is a production system please make sure you have backups of all the partitions. I suggest running sync a few times before running the application. If the write cache isn't working, you'll get errors about 50% of the time. If you run it 10 times without any errors you're probably safe. -chris -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
