I have two disks: one as parity, second as storage disk.

Now I want to add one more disk to storage (it is identical disk WD 4Tb). And I get an error "Disk in parity slot is not biggest".

 

New disk is /dev/sdd

root@unraid:~# fdisk -l /dev/sdb
Disk /dev/sdb: 3.64 TiB, 4000787030016 bytes, 7814037168 sectors
Disk model: WDC WD40EFRX-68W
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 4096 bytes
I/O size (minimum/optimal): 4096 bytes / 4096 bytes
Disklabel type: gpt
Disk identifier: B918B22C-1AAD-4DD5-B9FE-B22079663C9B

Device     Start        End    Sectors  Size Type
/dev/sdb1   2048 7814037134 7814035087  3.6T Linux RAID
root@unraid:~# fdisk -l /dev/sdc
Disk /dev/sdc: 3.64 TiB, 4000787030016 bytes, 7814037168 sectors
Disk model: WDC WD40EFRX-68N
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 4096 bytes
I/O size (minimum/optimal): 4096 bytes / 4096 bytes
Disklabel type: gpt
Disk identifier: 3D6BFC43-5FE0-284D-A42C-0D6FD2BE89F9

Device     Start        End    Sectors  Size Type
/dev/sdc1   2048 7814037134 7814035087  3.6T Linux RAID
root@unraid:~# fdisk -l /dev/sdd
Disk /dev/sdd: 3.64 TiB, 4000787030016 bytes, 7814037168 sectors
Disk model: WDC WD40EFPX-68C
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 4096 bytes
I/O size (minimum/optimal): 4096 bytes / 4096 bytes
Disklabel type: gpt
Disk identifier: 1BBED37A-811B-3349-8883-DE0966FDF783

Device     Start        End    Sectors  Size Type
/dev/sdd1   2048 7814035455 7814033408  3.6T Linux filesystem

 

I see an error in hdparm, but have no idea how to fix it.

root@unraid:~# hdparm -N /dev/sdb

/dev/sdb:
 max sectors   = 7814037168/7814037168, HPA is disabled
root@unraid:~# hdparm -N /dev/sdc

/dev/sdc:
 max sectors   = 7814037168/7814037168, HPA is disabled
root@unraid:~# hdparm -N /dev/sdd

/dev/sdd:
SG_IO: bad/missing sense data, sb[]:  70 00 05 00 00 00 00 0a 04 51 40 00 21 04 00 00 80 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
SG_IO: bad/missing sense data, sb[]:  70 00 05 00 00 00 00 0a 04 51 40 01 21 04 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 max sectors   = 7814037168/1(1?), HPA setting seems invalid (buggy kernel device driver?)

 

Regular operations (like manual partition create, format filesystem, etc) works correctly. Problem only on attach this drive to unraid array.

I use latest unraid on HP Microserver gen8, disks connected to SATA in drive bay. 

Edited July 6, 20242 yr by randa.alex

This will happen if parity disk had a previous partition starting on sector 2048, if it was unpartitioned, or had an invalid layout, Unraid would have created a partition starting on sector 64, so a lithe larger, there are two solutions:

 

1. Unassign parity, remove the partition with wipefs -a /dev/sdX, re-assign parity, Unraid will create a new partition on sector 64, parity will then need to be resynched
2. Manually create a partition starting on sector 2048 for the new disk with the command below before assigning it to the array, then assign it and it will use that partition

                   

sgdisk -o -a 8 -n 1:1M:0 /dev/sdX