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Coolface
n00b
Joined: 20 Dec 2002
Posts: 10
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 Posted: Sat Jan 29, 2005 1:23 pm Post subject: Raid 0, Dmsetup and sfdisk error |
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Hi, i just tried to install Gentoo Linux on my Via VT8237 Raid Harddisks. I followed the instructions of the Howtos in this Forum, but when i try to access my hd with sfdisk, i get the following error:
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root# echo "0 468883296 striped 2 64 /dev/sda 0 /dev/sdb 0" | dmsetup create rd
root# sfdisk -l -uS -q /dev/mapper/rd
Disk /dev/mapper/rd: cannot get geometry
Disk /dev/mapper/rd: 0 cylinders, 0 heads, 0 sectors/track
sfdisk: seek error: wanted 0x0000000000000000, got 0x0000000000000000
/dev/mapper/rd: unrecognized partition table type
No partitions found
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I have one Windows XP Partition, a logical Partition with 3 NTFS Partitions, a boot, and a root partition on it.
It might be the logical partition, because fdisk can access the hd, but cannot see the Partitions, which are in the Logical.
It would be quite nice, if anyone knows, why this error occurs...
I'm going crazy here 
THX, Coolface |
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frankjr
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Joined: 13 Sep 2002
Posts: 55
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| Posted: Sun Jan 30, 2005 2:23 am Post subject: |
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Are you sure you got the sector size (or whatever it is) right? Mine shows up as 64k in the vt8237 setup, so you should double the number like with my setup:
| Code: | | echo "0 468883296 striped 2 128 /dev/sda 0 /dev/sdb 0" | /sbin/dmsetup create raid |
You'd only use 64 if you have it set up as 32k in the raid controller setup.
One more thing I'd like to add when playing around with the partitions, never partition the disks under Linux, and be careful when you format the partitions, for example my cfdisk -l -uS shows this:
| Code: | Disk /dev/mapper/raid: cannot get geometry
Disk /dev/mapper/raid: 0 cylinders, 0 heads, 0 sectors/track
Warning: The partition table looks like it was made
for C/H/S=*/255/63 (instead of 0/0/0).
For this listing I'll assume that geometry.
Units = sectors of 512 bytes, counting from 0
Device Boot Start End #sectors Id System
/dev/mapper/raid1 * 63 16064 16002 7 HPFS/NTFS
/dev/mapper/raid2 16065 112454 96390 83 Linux
/dev/mapper/raid3 112455 468857024 468744570 f W95 Ext'd (LBA)
/dev/mapper/raid4 0 - 0 0 Empty
/dev/mapper/raid5 112518 2216969 2104452 6 FAT16
/dev/mapper/raid6 2217033 12723479 10506447 b W95 FAT32
/dev/mapper/raid7 12723543 240878609 228155067 e W95 FAT16 (LBA)
/dev/mapper/raid8 240878673 468857024 227978352 7 HPFS/NTFS
start: (c,h,s) expected (1023,254,63) found (1023,1,1)
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Here, I actually do have partitions 1, 2, 5, 6, 7, and 8, but not 3. If I decided to do a mke2fs /dev/mapper/raid3 (after you set them all up manually with dmsetup), then it would wipe out the entire extended partition (that contains 5 through 8). You can tell from the numbers that 3 covers all of the extended partition data. Extended partitions start with 5 and go up, so if you have 3 primary partitions, for example, don't be touching 4, or if you have 1, don't be touching 2, etc. |
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bitbasher
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Joined: 15 Mar 2005
Posts: 1
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| Posted: Tue Mar 15, 2005 12:20 am Post subject: sfdisk seek error |
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I had the same problem on a small 40G usb drive. I found an answer at the following link after I found that I could fix the error by modifying the source for the function llseek in sfdisk.c by changing the variables "in" and "out" to volatile. And rebuilding.
http://lfs.mirror.shizu-net.jp/patches/downloads/util-linux/util-linux-2.12e-sfdisk-1.patch
I have not had a chance to check this fix but I expect it will also fix the problem. |
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