2009/3/31 Ivan Voras <ivo...@freebsd.org>: > Juan Miscaro wrote: > >>> It looks like you created a both a fdisk partition table and a bsdlabel >>> partition table on the ad3 drive. If so, your data is probably already >>> corrupted. >> >> What is a generic configuration? Or can you explain how you come to >> that conclusion? > > RAID 0 means striping data across N drives (2 in your case), with a > fixed stripe size. From the information in kern.geom.confxml (which is > why gstripe list should work), your stripe size is 4 kB, which is good > for this purpose. This kind of setup is usually done with raw drives, > i.e. with GEOM_STRIPE: "gstripe label st0 ad1 ad3". After this, your > array is called stripe/st0 - this is where you create the file system, > etc. "Striping" means that each drive contains only a part of the data. > E.g. if you write 8 kB to the start of your array, the first 4 kB will > be written to ad1, the next 4 kB to ad3. Both smaller and larger > requests are handled logically. This means that the first sector on ad1 > contains the partition table of your array, if you partitioned it (and > it looks like you did). The first sector of ad3 contains whatever data > is at position 4096 in your array - probably nothing important because > your partitions start at 32 kB - 512. > > If you wrote only the partition table to ad3 then it's not a big deal - > it's useless but it may not corrupt anything important. If you proceeded > to to something else on ad3, then there could be problems. > >>> ad1 is also strangely partitioned but since it's your first drive in a >>> stripe this can be acceptable (it will contain the first sectors of the >>> array, including its partition tables). >>> >>>> # gstripe dump ad3 >>>> Can't read metadata from ad3: Invalid argument. >>>> Not fully done. >>> This can happen if the metadata on ad3 is corrupted. You'll need to dump >>> the last sector and inspect it to verify. >> >> I've never done that before. Can you be explicit? > > Using information from your previous posts, you should do this: > > # dd if=/dev/ad3 of=ad3last count=1 skip=625142447 > # hd ad3last > >
Thanks for that great explanation. The file ad3last.txt is attached. -- jm
00000000 24 47 41 46 52 10 41 08 00 00 00 00 00 00 00 00 |$GAFR.A.........| 00000010 00 00 00 00 00 00 00 00 00 00 6f e2 42 25 00 00 |..........o�B%..| 00000020 00 00 00 08 00 00 00 00 00 00 00 00 00 00 00 00 |................| 00000030 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |................| * 00000100 26 30 36 2f 32 37 2f 32 30 30 36 2d 50 34 4d 38 |&06/27/2006-P4M8| 00000110 30 30 50 72 6f 2d 38 32 33 2d 36 41 37 4c 36 47 |00Pro-823-6A7L6G| 00000120 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |................| * 00000200
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