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$ sudo yum install kvm libvirt 

$ sudo yum install virt-manager

       --sparse=WHEN

              control creation of sparse files. See below

        By default, sparse SOURCE files are detected by a crude heuristic and the corresponding DEST file is made sparse as well.  That is the behavior selected by --sparse=auto.  Specify --sparse=always to create a sparse DEST file whenever the SOURCE file contains a long enough sequence of zero bytes.  Use --sparse=never to inhibit creation of sparse files.

       -S, --sparse

              Handle sparse files efficiently.  Some files in the file system may have segments which were actually never written (quite often these are database files created by such systems as DBM).  When given this option, tar attempts to determine if the file is sparse prior to archiving it, and if so, to reduce the resulting archive size by not dumping empty parts of the file. 

$ tar -cvfS test_spar.tar 123123.qcow2

$ tar -S -cvf test_spar.tar 123123.qcow2 

$ ll

-rw-------. 1 root root   9665380352 Aug  8  2018 123123.qcow2

-rw-r--r--. 1 root root      1484800 Feb 14 18:10 test_spar.tar

-rw-r--r--. 1 root root   9665382400 Feb 14 18:09 test.tar

 To have tar attempt to recognize the holes in a file, use `--sparse' (`-S'). 

Advantages

The advantage of sparse files is that storage is only allocated when actually needed: disk space is saved, and large files can be created even if there is insufficient free space on the file system.

Disadvantages

Disadvantages are that sparse files may become fragmented; file system free space reports may be misleading; filling up file systems containing sparse files can have unexpected effects; and copying a sparse file with a program that does not explicitly support them may copy the entire, uncompressed size of the file, including the sparse, mostly zero sections which are not on disk -- losing the benefits of the sparse property in the file. 

ls -s tells you the allocated size of the file, always a multiple of the allocation unit. ls -l tells the actual size. An easy way to test: 

$ man ls

       --block-size=SIZE

              scale sizes by SIZE before printing them; e.g., '--block-size=M'

              prints sizes in units of 1,048,576 bytes; see SIZE format below 

2. Update the firmware from FTP or HTTP source

FTP address: ftp.dell.com 
Catalog location: catalog 
Catalog File Name: catalog.xml.gz

It is also possible to use the HTTP method if the FTP method is not responding properly.

HTTP address is : downloads.dell.com 

#################################################

  OpenManage || iDRAC Service Module

#################################################

    Available feature options:

   [x] 1. Watchdog Instrumentation Service

   [x] 2. LifeCycle Log Information

   [x] 3. Operating System Information

   [ ] 4. iDRAC access via Host OS

           [ ] a. Access via GUI, WS-man, Redfish, Remote Racadm

           [ ] b. In-band SNMP Traps

           [ ] c. Access via SNMP Get

       5. iDRAC Hard Reset

       6. Support Assist

       7. Full Power Cycle

   [ ] 8. All Features

  Enter the number to select/deselect a feature from the above list.

                ( multiple feature selection should be comma separated)

                ( to select sub-features, please use 4.a,4.b, etc.)

  Enter q to quit.

  Enter :

#################################################

  OpenManage || iDRAC Service Module

#################################################

    Available feature options:

   [x] 1. Watchdog Instrumentation Service

   [x] 2. LifeCycle Log Information

   [x] 3. Operating System Information

   [x] 4. iDRAC access via Host OS

           [x] a. Access via GUI, WS-man, Redfish, Remote Racadm

           [x] b. In-band SNMP Traps

           [x] c. Access via SNMP Get

       5. iDRAC Hard Reset

       6. Support Assist

       7. Full Power Cycle

   [x] 8. All Features

  Enter the number to select/deselect a feature

        ( multiple feature selection should be comma separated)

                ( to select sub-features, please use 4.a,4.b, etc.)

  Enter i to install the selected features.

  Enter q to quit.

  Enter : 

  Enter : i

경고: /root/downlaod/RHEL7/x86_64/dcism-3.2.0-1234.el7.x86_64.rpm: Header V4 RSA/SHA512 Signature, key ID 34d8786f: NOKEY

준비 중...                         ################################# [100%]

Updating / installing...

   1:dcism-3.2.0-1234.el7             ################################# [100%]

Enter a valid port number for iDRAC access via Host OS or Enter to take default port number: 

Enter a valid port number for iDRAC access via Host OS or Enter to take default port number:

Do you want the services started?

   Press ('y' for yes | 'Enter' to exit): y

  Checking for iSM communication with iDRAC...

    Waiting...                  ######################### 

# setsebool samba_export_all_rw 1 

[root@localhost ~]# getsebool -a | grep samba

samba_create_home_dirs --> off

samba_domain_controller --> off

samba_enable_home_dirs --> off

samba_export_all_ro --> off

samba_export_all_rw --> off

samba_load_libgfapi --> off

samba_portmapper --> off

samba_run_unconfined --> off

samba_share_fusefs --> off

samba_share_nfs --> off

sanlock_use_samba --> off

tmpreaper_use_samba --> off

use_samba_home_dirs --> off

virt_use_samba --> off

[root@localhost ~]# getsebool -a | grep smb

smbd_anon_write --> off

[root@localhost ~]# getsebool -a | grep nmb

[root@localhost ~]# 

If you want to allow samba to share any file/directory read/write, you must turn on the samba_export_all_rw boolean.

setsebool -P samba_export_all_rw 1 

firewall-cmd --permanent --zone=public --add-service=samba

firewall-cmd --reload