Storage

This section provides an overview of commands and configurations related to disk storage management.

Rescan disk without bootting

echo "- - -" | tee /sys/class/scsi_host/host*/scan

dd if=/dev/sdc of=/home/mako/damaged_P300_disk.img bs=64K conv=noerror,sync

This subsection explains how to check and extend disk partitions.

Checks the current disk and partition sizes.

lsblk

Output example:

NAME    MAJ:MIN RM  SIZE RO TYPE MOUNTPOINTS
sdb       8:16   0  110G  0 disk
└─sdb1    8:17   0  100G  0 part /rsync

Explains how to extend the partition size.

growpart -N /dev/sdb 1
growpart /dev/sdb 1

Checks the updated partition sizes.

lsblk

Output example:

NAME    MAJ:MIN RM  SIZE RO TYPE MOUNTPOINTS
sdb       8:16   0  110G  0 disk
└─sdb1    8:17   0  110G  0 part /rsync

Checks the file system disk space usage.

df -h

Output example:

Filesystem      Size  Used Avail Use% Mounted on
/dev/sdb1        98G   24K   93G   1% /rsync

Resizes the file system to use the extended partition space.

resize2fs /dev/sdb1

Checks the updated file system disk space usage.

Filesystem      Size  Used Avail Use% Mounted on
/dev/sdb1       108G   24K  103G   1% /rsync

This subsection covers the installation and management of iSCSI targets.

Installs the necessary packages for iSCSI.

apt -y install open-iscsi lsscsi

Discovers available iSCSI targets from the specified IP/DNS.

iscsiadm -m discovery -t sendtargets -p ${IP/DNS}

Connects to the discovered iSCSI targets.

iscsiadm -m node --login

Shows the current iSCSI sessions and lists SCSI devices.

iscsiadm -m session -o show
lsscsi

vi /etc/iscsi/nodes/************/default
node.startup=automatic 
lsscsi --transport

Logout from iSCSI targets.

iscsiadm --mode node --target ${IQN} --portal ${IP/DNS} --logout
iscsiadm --mode node --logoutall=all

apt install  samba-common smbclient samba-common-bin smbclient  cifs-utils

vi /root/.rasp
user=SMBusername
password=SMBpassword

//192.168.1.10/SMB_share_name   /mnt/nas      cifs    uid=0,credentials=/root/.rasp,iocharset=utf8,vers=3.0,noperm,noserverino,nofail  0 0

fallocate -l 2G /swap
chmod 600 /swap
mkswap /swap

swapon /swap
swapon --show

cp /etc/fstab /etc/fstab.bak
echo '/swap none swap sw 0 0' | tee -a /etc/fstab

cat /proc/sys/vm/swappiness
sysctl vm.swappiness=10

vi /etc/sysctl.conf
vm.swappiness=10
sysctl -p

apt install smem