On Die, 2012-07-03 at 03:46 -0500, Stan Hoeppner wrote: > On 7/3/2012 2:50 AM, Ramon Hofer wrote: > > Hi all > > Hi Ramon, welcome to XFS. > > > I hope this is the right place to ask this: > > It is. But I could have answered this, and any of your XFS questions, > off list as well. ;) Yes, I know. But I didn't want to abuse you as my personal question answering machine ;-) > > I wanted to use a 2 TB disk (as mythtv recordings drive) with the xfs > > filesystem. Until now I had jfs but I wanted to switch it. > > > > Since I have two drives of the same type I formatted the new drive with > > xfs and copied the recordings onto it. Today I saw that I created the > > filesystem over the disk instead of the partition: > > Had you already put a partition on the disk? Yes, I have. > > ~# mkfs.xfs /dev/sdk > > If yes, did mkfs.xfs throw a warning about overwriting the partition table? Yes, it did. And I was confused because I thought the warning was because the disk was in the md9 raid before. But since I have overwritten the raid partition now I realize that the warning was about the partition I created afterwards... > > These are my two disks: > > > > /dev/sdi1 jfs 1.9T 1.9T 3.9G 100% /mnt/recordings > > /dev/sdk xfs 1.9T 1.9T 3.3G 100% /mnt/recordings_temp > > > > Is it ok to use the disk instead of the partition or why do I have to > > create the filesystem on a partition? > > It's not necessary to put a partition on the disk before formatting with > XFS. And in fact, when using Advanced Format drives, it's much easier > to make sure XFS is sector aligned by directly formatting the disk. > > Partitioning an AF drive to get proper sector alignment can be tricky. > If you don't get proper sector alignment of the partition, you end up > with a read/modify/write cycle when a filesystem block is modified. > This reduces the performance of the drive significantly. For a write > mostly mythTV recording drive this probably isn't critical. But if you > can avoid the misaligned sector problem it's best to do so. And you > easily can by directly formatting the disk device. So it's better to directly format the disk and not the partition. I will redo that :-) Cheers Ramon _______________________________________________ xfs mailing list xfs@xxxxxxxxxxx http://oss.sgi.com/mailman/listinfo/xfs
