ext4 is the default file system of Red Hat Enterprise Linux 6.
Advantages:
- Improves performance
- Reduces metadata overhead for large files
- Labels unallocated block groups and inode tables
Allocation schemes:
- Persistent pre-allocation
- Delayed allocation
- Multi-block allocation
- Stripe-aware allocation
1. Go to RHEL6 - Settings - Add - virtual - HDD - Create a new virtual HDD - SCSI - 5GB (Store virtual disk as a single file)-give the disk file name and click finish then reboot.
Primary Partitioning
#for partitioning the virtul HDD go terminal and give fdisk
fdisk /dev/sdb
m -for help
n -new partition (give p for primary partition, the partition number and size, maximum can create 4 primary partitions and should create before creating extented partition.)
p -show partition table
w-write and quit
#for updating the partition table.
partprobe
#formating the partition table
mkfs.ext4 /dev/sdb1 (listen to 3 times done)
#create mount point
mkdir /primary
#edit fstab
vim /etc/fstab
/dev/sdb1 /primary ext4 defaults 0 0
#mount
mount -a
mount (shows all mount points)
cd /primary
ls (and confirm with the precentece of lost+found file
fdisk -l (shows all partitions)
Extented partitioning
#for creating extented partitioning
fdisk /dev/sdb
m-for help
n-new partition (give e for extented partition, partition number and size will be the remaining)
p-show partition table
w-write and quit (do't format and mount the extented patition)
Logical Partitioning
#for creating extented partitioning
fdisk /dev/sdb
m-for help
n-new partition (give l for logical partitioning and also give size, it will take partion number starting from 5 onwards by default)
p-show partition table
w-write and quit
#for updating the partition table.
partprobe
#formating the partition table
mkfs.ext4 /dev/sdb5 ( and listen to 3 times 'done')
#create mount point
mkdir /logical
#edit fstab
vim /etc/fstab
/dev/sdb5 /logical ext4 defaults 0 0
#mount
mount -a
mount (shows all mount points)
cd /primary
ls (and confirm with the precentece of lost+found file)
fdisk -l (shows all partitions)
deleting a partition
#remove fstab
vim /etc/fstab - do delete the particular entry
mount -a
umount /logical
fdisk /dev/sdb
d - to delete give the approptiate partition number
w-write and quit
partprobe
Graphical Method
palimpsest - for opening the Disk Utility method from the command mode
Otherwise go to Applications - System Tools - Disk Utility
Create Partition - to create a partition
Format Drive - to format the drive
Format Volume - for formatting a particular volume
Mount Volume - to mounting a volume
Unmount Volume - for a unmounted volume
Delete Partition - to deleting a partition
Note:- Logical partitioning is not available in graphical method.
Benchmark :- shows how data is written in HDD.
1. Start Read-Only Benchmark - Mesure read rate and access time
2. Start Read/Write Benchmark - Mesure read rate, write rate and access time
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