File System Creation Might Fail on Small Slices (6346510)

Creating a UFS file system with the newfs command might fail under the following conditions:

• The size of the slice is small, approximately less than 4 Mbytes.

• The size of the disk exceeds 8 Gbytes.

The error is caused by the large-size requirement of the file system for metadata. The following warning message is displayed:

Warning: inode blocks/cyl group (295) >= data blocks (294) in last
     cylinder group. This implies 4712 sector(s) cannot be allocated.
/dev/rdsk/c0t0d0s6:     0 sectors in 0 cylinders of 48 tracks, 128 sectors
         0.0MB in 0 cyl groups (13 c/g, 39.00MB/g, 18624 i/g)
super-block backups (for fsck -F ufs -o b=#) at:
#

Workaround: As superuser, perform one of the following workarounds:

• Workaround 1: Specify the number of tracks when you use the newfs command. Follow these steps.

  1. Use the format command to find out the number of tracks to assign. For example:

     # format Searching for disks...done AVAILABLE DISK SELECTIONS: 0. c0t0d0 <SUN18G cyl 7506 alt 2 hd 19 sec 248> /pci@1f,4000/scsi@3/sd@0,0 Specify disk (enter its number):

     In the example, the number of tracks is 19.

  2. Assign the number to the file system that you create with the newfs command. For example:

     # newfs -v -t 19 /dev/dsk/c0t0d0s6 newfs: construct a new file system /dev/rdsk/c0t0d0s6: (y/n)? y mkfs -F ufs /dev/rdsk/c0t0d0s6 4712 -1 19 8192 1024 16 10 167 2048 t 0 -1 8 128 n mkfs: bad value for nsect: -1 must be between 1 and 32768 mkfs: nsect reset to default 32 Warning: 152 sector(s) in last cylinder unallocated /dev/rdsk/c0t0d0s6: 4712 sectors in 8 cylinders of 19 tracks, 32 sectors 2.3MB in 1 cyl groups (16 c/g, 4.75MB/g, 2304 i/g) super-block backups (for fsck -F ufs -o b=#) at: 32, #

• Workaround 2: Specify the number of bytes per inode (nbpi) in the newfs command to reduce the inode density in the file system. For example:

  # newfs -i 4096 /dev/dsk/c0t0d0s6 newfs: construct a new file system /dev/rdsk/c0t0d0s6: (y/n)? y Warning: 1432 sector(s) in last cylinder unallocated /dev/rdsk/c0t0d0s6: 4712 sectors in 1 cylinders of 48 tracks, 128 sectors 2.3MB in 1 cyl groups (16 c/g, 48.00MB/g, 11648 i/g) super-block backups (for fsck -F ufs -o b=#) at: 32, #