iStor problem solved / can’t find block in cyl 0 / cg 0: bad magic number
After over one year working together with Danny Braniss and testing several thousands of options, settings and configurations, I managed to get the iStore iSCSI-device working together with FreeBSD.
Just to remember. The following error occured, when trying to write an UFS filesystem to the device:
newfs -O2 /dev/da0s1
/dev/da0s1: 782023.5MB (1601584044 sectors) block size 16384, fragment size 2048
using 4256 cylinder groups of 183.77MB, 11761 blks, 23552 inodes.
super-block backups (for fsck -b #) at:
160, 376512, 752864, … … …
1601377920
internal error: can’t find block in cyl 0
And in dangerously dedicated mode:
“# newfs -O2 /dev/da0“
Creating the lable in this mode fails with the message:
newfs -O2 /dev/da0
/dev/da0: 782023.5MB (1601584044 sectors) block size 16384, fragment size 2048
using 4256 cylinder groups of 183.77MB, 11761 blks, 23552 inodes.
super-block backups (for fsck -b #) at:
160, 376512, 752864, … … …
1601377920
internal error: cg 0: bad magic number
The important hint I got from a test with a PetaStor system, where everything worked perfectly. On the FreeBSD-FS mailinglist, I got the last part of the puzzle. Creating the filesystem works with these commands:
“# gpart create -s GPT da0"
# gpart show da0
# gpart add -b 34 -s 20971519 -t freebsd-ufs -l AnosLabel da0
# newfs -O2 /dev/da0p1
Important: Replace 20971519 by the size of your device, given by gpart show da0.
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