Friday, June 12, 2009

Managing the Solaris OE File System

Solaris Interview Questions and Answers

Managing the Solaris OE File System

ufs – Unix FS hsfs – High Sierra FS pcfs – PC FS for DOS FAT32 FS
udfs – Universal Disk Format FS nfs - Network FS
Pseudo FS – Memory based FS tmpfs swapfs procfs mntfs

VTOC present in the first sector in the raw disk area.
VTOC - 512 sector

Boot Block - 1-15 sector
Super Block - 16-31
First Cylinder Group - 32

Creating File Systems

# newfs /dev/rdsk/c1d0s0 - Creating FS
# newfs –i 16384 /dev/rdsk/c1d0s0 - Creating FS with data block size 16KB

# mount /dev/dsk/c1d0s0 /p1 - Mounting partition in /p1 directory

# fstyp –v /dev/rdsk/c1d0s0
grep minfree
minfree 6% - To know the reserved disk space

# tunefs –m 2 /dev/rdsk/c1d0s0 - This will reduce the reserved space to 2%

# umount /p1 - To umount a partition.

Never run the fsck command on a mounted FS. The /, /usr and /var FS should have the fsck command run on them on single user mode

# fsck /dev/rdsk/c0td0s7 - To check the FS in interactive mode
# fsck –o f,p /dev/rdsk/c0t0d0s7 - f – forces p – preen or Non interactive mode
# fsck –y /dev/rdsk/c0t0d0s7 - It answers that to all questions we said yes with –y option

# newfs –N /dev/rdsk/c0t0d0s7 - To view the locations of alternative backup superblocks

# fsck –o b=32 /dev/rdsk/c0t0d0s7 -Will retrieve the corrupted partition.
# dd if=/dev/zero of=/dev/rdsk/c0d0s7 bs=512 count=32 - It will corrupt the partition
# df - Shows disk detail in blocks
# df –k (in KB)
# df –h - Displays disk allocation in MB & GB

# df –e - Points only the number of files free

# du –k - Displays disk use in KB

# du –s - Displays only the summary in 512 bytes blocks. Using the s and k options together shows summary in KB

# du –h /opt - Shows the disk usage by the directory

# quot –a - Reports on all mounted file systems

# quot –f - Include the number of files

# quot –h /export/home - Shows disk usage userwise in the particular directory

1 comment:

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