Package: libparted2 Version: 3.2-6 Severity: grave libparted2 breaks my RAID GPT header!
There appears to be a disagreement between parted and fdisk as to the correct size. fdisk is happy after creating a GPT partition table, but parted is not and seems to be forcibly applying what it believes to be correct (ignoring the fact that it was only asked to display info, not modify anything). Having done so however parted is still not happy and now neither is fdisk. Letting parted create the partition table just leaves both unhappy, reporting the same issues. In testing reproducibility of my issue here I deleted and recreated the array, and proceeded to test as documented below, which explains things more clearly. **Please pay particular attention to what happened at the very end of test #3, which is why I marked this as severity grave! I would appreciate a quick turnaround on this issue, so I can get on with actually using this RAID array without fear of breaking it simply by running parted -l or opening gparted. Background ================= I have a 'fake-raid' RAID0 array, created from two HDDs using my motherboard firmware. This is not used for root, just data. sdb and sdc are the RAID members here and the RAID device is md126. fdisk -l and parted -l output (cut down to only the devices in question) generated during this procedure is attached. Test#1 - gparted ================= 1) Deleted and recreated the RAID array (in MB firmware). 2) Checked fdisk -l and parted -l (see fdisk1 and parted1 output files). fdisk is happy, parted only complains about unrecognised disk labels. 3) In gparted, with device md126 selected, I asked it to create a GPT partition table. This was done with no errors reported. gparted shows warnings for both sdb and sdc. The warning for sdc is just an unrecognised disk label warning, but the warning against sdb is: "Both the primary and backup GPT tables are corrupt."! Checking fdisk -l, I see an "GPT PMBR size mismatch" error. I created the fdisk2 and parted2 files at this stage. For some reason fdisk now sees a device '/dev/sdb1', with size equal to that of the full array. I had not created any partitions yet. Test#2 - parted ================= 1) Deleted and recreated the RAID array (in MB firmware). 2) Checked fdisk and parted to make sure things had been reset correctly, they were. 3) Ran: sudo parted /dev/md126 mktable GPT This ran with no errors directly reported. 4) Checked parted -l, which reported the same corruption issue above (see parted3). 5) Checked fdisk -l, which reported the GPT PMBR size mismatch error as before (see fdisk3). Test#3 - fdisk ================= 1) Deleted and recreated the RAID array (in MB firmware). 2) Checked fdisk and parted to make sure things had been reset correctly, they were. 3) Ran: sudo fdisk /dev/md126 g (create a new empty GPT partition table) v (verify) - no errors, looked good to me w (write) - no errors: "The partition table has been altered. Calling ioctl() to re-read partition table. Syncing disks." 4) Checked fdisk -l output, which looks absolutely fine (see fdisk4). 5) Checked parted -l. This still complains about a corrupt GPT header. (See parted4). 6) Happened to check fdisk -l again, how it's reporting the GPT PMBR size mismatch error from before (See fdisk5). So it seems that the parted -l command here seems to have tried to forcibly correct the issue it was unhappy with, breaking what fdisk seemed to have done correctly.
Disk /dev/sdc: 931.5 GiB, 1000204886016 bytes, 1953525168 sectors Units: sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk /dev/sdb: 931.5 GiB, 1000204886016 bytes, 1953525168 sectors Units: sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk /dev/md126: 1.8 TiB, 2000381018112 bytes, 3906994176 sectors Units: sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 16384 bytes / 32768 bytes
GPT PMBR size mismatch (3906994175 != 1953525167) will be corrected by w(rite). Disk /dev/sdc: 931.5 GiB, 1000204886016 bytes, 1953525168 sectors Units: sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk /dev/sdb: 931.5 GiB, 1000204886016 bytes, 1953525168 sectors Units: sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disklabel type: dos Disk identifier: 0x00000000 Device Boot Start End Sectors Size Id Type /dev/sdb1 1 3906994175 3906994175 1.8T ee GPT Disk /dev/md126: 1.8 TiB, 2000381018112 bytes, 3906994176 sectors Units: sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 16384 bytes / 32768 bytes Disklabel type: gpt Disk identifier: DE63532F-0214-43B7-9329-462908AD5B16
GPT PMBR size mismatch (3906994175 != 1953525167) will be corrected by w(rite). Disk /dev/sdb: 931.5 GiB, 1000204886016 bytes, 1953525168 sectors Units: sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disklabel type: dos Disk identifier: 0x00000000 Device Boot Start End Sectors Size Id Type /dev/sdb1 1 3906994175 3906994175 1.8T ee GPT Disk /dev/sdc: 931.5 GiB, 1000204886016 bytes, 1953525168 sectors Units: sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk /dev/md126: 1.8 TiB, 2000381018112 bytes, 3906994176 sectors Units: sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 16384 bytes / 32768 bytes Disklabel type: gpt Disk identifier: 9E506ECB-2D2D-455B-A3FA-34FB5E59FC74
Disk /dev/sdb: 931.5 GiB, 1000204886016 bytes, 1953525168 sectors Units: sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk /dev/sdc: 931.5 GiB, 1000204886016 bytes, 1953525168 sectors Units: sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk /dev/md126: 1.8 TiB, 2000381018112 bytes, 3906994176 sectors Units: sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 16384 bytes / 32768 bytes Disklabel type: gpt Disk identifier: A0427F0B-BE15-4FDF-9770-63C2A3577965
GPT PMBR size mismatch (3906994175 != 1953525167) will be corrected by w(rite). Disk /dev/sdb: 931.5 GiB, 1000204886016 bytes, 1953525168 sectors Units: sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disklabel type: dos Disk identifier: 0x00000000 Device Boot Start End Sectors Size Id Type /dev/sdb1 1 3906994175 3906994175 1.8T ee GPT Disk /dev/sdc: 931.5 GiB, 1000204886016 bytes, 1953525168 sectors Units: sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk /dev/md126: 1.8 TiB, 2000381018112 bytes, 3906994176 sectors Units: sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 16384 bytes / 32768 bytes Disklabel type: gpt Disk identifier: A0427F0B-BE15-4FDF-9770-63C2A3577965
Error: /dev/sdb: unrecognised disk label Error: /dev/sdc: unrecognised disk label Error: /dev/md126: unrecognised disk label Model: ATA WDC WD1001FALS-0 (scsi) Disk /dev/sdb: 1000GB Sector size (logical/physical): 512B/512B Partition Table: unknown Disk Flags: Model: ATA WDC WD1001FALS-0 (scsi) Disk /dev/sdc: 1000GB Sector size (logical/physical): 512B/512B Partition Table: unknown Disk Flags: Model: Linux Software RAID Array (md) Disk /dev/md126: 2000GB Sector size (logical/physical): 512B/512B Partition Table: unknown Disk Flags:
Error: Both the primary and backup GPT tables are corrupt. Try making a fresh table, and using Parted's rescue feature to recover partitions. Error: /dev/sdc: unrecognised disk label Model: ATA WDC WD1001FALS-0 (scsi) Disk /dev/sdb: 1000GB Sector size (logical/physical): 512B/512B Partition Table: unknown Disk Flags: Model: ATA WDC WD1001FALS-0 (scsi) Disk /dev/sdc: 1000GB Sector size (logical/physical): 512B/512B Partition Table: unknown Disk Flags: Model: Linux Software RAID Array (md) Disk /dev/md126: 2000GB Sector size (logical/physical): 512B/512B Partition Table: gpt Disk Flags: Number Start End Size File system Name Flags
Error: Both the primary and backup GPT tables are corrupt. Try making a fresh table, and using Parted's rescue feature to recover partitions. Error: /dev/sdc: unrecognised disk label Model: ATA WDC WD1001FALS-0 (scsi) Disk /dev/sdb: 1000GB Sector size (logical/physical): 512B/512B Partition Table: unknown Disk Flags: Model: ATA WDC WD1001FALS-0 (scsi) Disk /dev/sdc: 1000GB Sector size (logical/physical): 512B/512B Partition Table: unknown Disk Flags: Model: Linux Software RAID Array (md) Disk /dev/md126: 2000GB Sector size (logical/physical): 512B/512B Partition Table: gpt Disk Flags: Number Start End Size File system Name Flags
Error: Both the primary and backup GPT tables are corrupt. Try making a fresh table, and using Parted's rescue feature to recover partitions. Error: /dev/sdc: unrecognised disk label Model: ATA WDC WD1001FALS-0 (scsi) Disk /dev/sdb: 1000GB Sector size (logical/physical): 512B/512B Partition Table: unknown Disk Flags: Model: ATA WDC WD1001FALS-0 (scsi) Disk /dev/sdc: 1000GB Sector size (logical/physical): 512B/512B Partition Table: unknown Disk Flags: Model: Linux Software RAID Array (md) Disk /dev/md126: 2000GB Sector size (logical/physical): 512B/512B Partition Table: gpt Disk Flags: Number Start End Size File system Name Flags
