Disk Images - Revision history

Rwh: /* Kernel-side Block Disk Activity */

2026-03-02T18:18:34Z

Kernel-side Block Disk Activity

← Older revision		Revision as of 14:18, 2 March 2026
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	= Kernel-side Block Disk Activity =		= Kernel-side Block Disk Activity =
	Install: [https://github.com/iovisor/bcc BPF Compiler Collection (BCC)]. BCC is a toolkit for creating efficient kernel tracing and manipulation programs, and includes several useful tools and examples. It makes use of extended BPF (Berkeley Packet Filters)		Install: [https://github.com/iovisor/bcc BPF Compiler Collection (BCC)]. BCC is a toolkit for creating efficient kernel tracing and manipulation programs, and includes several useful tools and examples. It makes use of extended BPF (Berkeley Packet Filters).

			Use the biotop utility to show Block level device (disk) I/O by process top:

			[root@nst42 ~]# dnf install bcc-tools;
			[root@nst42 ~]# cd /usr/share/bcc/tools;
			[root@nst42 ~]# ./biotop

Rwh: /* Kernel-side Block Disk Activity */

2026-03-02T18:13:52Z

Kernel-side Block Disk Activity

← Older revision		Revision as of 14:13, 2 March 2026
Line 222:		Line 222:

	= Kernel-side Block Disk Activity =		= Kernel-side Block Disk Activity =
	Install: [https://github.com/iovisor/bcc BPF Compiler Collection (BCC)]		Install: [https://github.com/iovisor/bcc BPF Compiler Collection (BCC)]. BCC is a toolkit for creating efficient kernel tracing and manipulation programs, and includes several useful tools and examples. It makes use of extended BPF (Berkeley Packet Filters)

Rwh: /* How Do I Mount A Partition From A Disk Image Using: losetup? */

2026-03-02T18:12:51Z

How Do I Mount A Partition From A Disk Image Using: losetup?

← Older revision		Revision as of 14:12, 2 March 2026
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	[root@vortex livecd]# umount /mnt/vfat;		[root@vortex livecd]# umount /mnt/vfat;
	[root@vortex livecd]# losetup -d /dev/loop0;		[root@vortex livecd]# losetup -d /dev/loop0;

			= Kernel-side Block Disk Activity =
			Install: [https://github.com/iovisor/bcc BPF Compiler Collection (BCC)]

Rwh: /* How Do I Mount A Partition From A Disk Image Using: losetup? */

2020-05-18T14:15:37Z

How Do I Mount A Partition From A Disk Image Using: losetup?

← Older revision		Revision as of 10:15, 18 May 2020
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	Example: ISO disk image: "'''nst-minimal-32.x86_64.iso'''"		Example: ISO disk image: "'''nst-minimal-32.x86_64.iso'''"

	List Partitions:		List Partitions (fdisk):
	[root@vortex livecd]# fdisk -l ./nst-minimal-32.x86_64.iso;		[root@vortex livecd]# fdisk -l ./nst-minimal-32.x86_64.iso;
	Disk ./nst-minimal-32.x86_64.iso: 1.17 GiB, 1247232000 bytes, 2436000 sectors		Disk ./nst-minimal-32.x86_64.iso: 1.17 GiB, 1247232000 bytes, 2436000 sectors
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	./nst-minimal-32.x86_64.iso3 16644 54355 37712 18.4M ef EFI (FAT-12/16/32)		./nst-minimal-32.x86_64.iso3 16644 54355 37712 18.4M ef EFI (FAT-12/16/32)

	Create Loop Partitions:		Create Loop Partitions (losetup):
	[root@vortex livecd]# losetup -P -f ./nst-minimal-32.x86_64.iso;		[root@vortex livecd]# losetup -P -f ./nst-minimal-32.x86_64.iso;
	[root@vortex livecd]#		[root@vortex livecd]#
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	/dev/loop0p3 16644 54355 37712 18.4M ef EFI (FAT-12/16/32)		/dev/loop0p3 16644 54355 37712 18.4M ef EFI (FAT-12/16/32)

	Mount A Loop Partition:		Mount A Loop Partition (mount):
	[root@vortex livecd]# mount -v /dev/loop0p3 /mnt/vfat;		[root@vortex livecd]# mount -v /dev/loop0p3 /mnt/vfat;
	mount: /dev/loop0p3 mounted on /mnt/vfat.		mount: /dev/loop0p3 mounted on /mnt/vfat.

Rwh: /* How Do I Mount A Partition From A Disk Image Using: losetup? */

2020-05-18T14:14:30Z

How Do I Mount A Partition From A Disk Image Using: losetup?

← Older revision		Revision as of 10:14, 18 May 2020
Line 166:		Line 166:
	This section uses the '''[https://en.wikipedia.org/wiki/Loop_device losetup]''' command to help with mounting a partition within a disk image.		This section uses the '''[https://en.wikipedia.org/wiki/Loop_device losetup]''' command to help with mounting a partition within a disk image.

	Example: ISO image: "'''nst-minimal-32.x86_64.iso'''"		Example: ISO disk image: "'''nst-minimal-32.x86_64.iso'''"

	List Partitions:		List Partitions:

Rwh: /* How Do I Mount A Partition From A Disk Image Using: losetup? */

2020-05-18T14:13:33Z

How Do I Mount A Partition From A Disk Image Using: losetup?

← Older revision		Revision as of 10:13, 18 May 2020
Line 165:		Line 165:
	= How Do I Mount A Partition From A Disk Image Using: losetup? =		= How Do I Mount A Partition From A Disk Image Using: losetup? =
	This section uses the '''[https://en.wikipedia.org/wiki/Loop_device losetup]''' command to help with mounting a partition within a disk image.		This section uses the '''[https://en.wikipedia.org/wiki/Loop_device losetup]''' command to help with mounting a partition within a disk image.

			Example: ISO image: "'''nst-minimal-32.x86_64.iso'''"

	List Partitions:		List Partitions:

Rwh: /* How Do I Mount A Partition From A Disk Image Using: losetup? */

2020-05-18T13:47:19Z

How Do I Mount A Partition From A Disk Image Using: losetup?

← Older revision		Revision as of 09:47, 18 May 2020
Line 167:		Line 167:

	List Partitions:		List Partitions:
	[root@vortex livecd]# fdisk -l ./nst-minimal-32.x86_64.iso		[root@vortex livecd]# fdisk -l ./nst-minimal-32.x86_64.iso;
	Disk ./nst-minimal-32.x86_64.iso: 1.17 GiB, 1247232000 bytes, 2436000 sectors		Disk ./nst-minimal-32.x86_64.iso: 1.17 GiB, 1247232000 bytes, 2436000 sectors
	Units: sectors of 1 * 512 = 512 bytes		Units: sectors of 1 * 512 = 512 bytes
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	Create Loop Partitions:		Create Loop Partitions:
	[root@vortex livecd]# losetup -P -f ./nst-minimal-32.x86_64.iso		[root@vortex livecd]# losetup -P -f ./nst-minimal-32.x86_64.iso;
	[root@vortex livecd]#		[root@vortex livecd]#
	[root@vortex livecd]# losetup -l		[root@vortex livecd]# losetup -l;
	NAME SIZELIMIT OFFSET AUTOCLEAR RO BACK-FILE DIO LOG-SEC		NAME SIZELIMIT OFFSET AUTOCLEAR RO BACK-FILE DIO LOG-SEC
	/dev/loop0 0 0 0 0 /home/nst/dev32/livecd/nst-minimal-32.x86_64.iso 0 512		/dev/loop0 0 0 0 0 /home/nst/dev32/livecd/nst-minimal-32.x86_64.iso 0 512
	[root@vortex livecd]#		[root@vortex livecd]#
	[root@vortex livecd]# fdisk -l /dev/loop0		[root@vortex livecd]# fdisk -l /dev/loop0;
	Disk /dev/loop0: 1.17 GiB, 1247232000 bytes, 2436000 sectors		Disk /dev/loop0: 1.17 GiB, 1247232000 bytes, 2436000 sectors
	Units: sectors of 1 * 512 = 512 bytes		Units: sectors of 1 * 512 = 512 bytes
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	Mount A Loop Partition:		Mount A Loop Partition:
	[root@vortex livecd]# mount -v /dev/loop0p3 /mnt/vfat		[root@vortex livecd]# mount -v /dev/loop0p3 /mnt/vfat;
	mount: /dev/loop0p3 mounted on /mnt/vfat.		mount: /dev/loop0p3 mounted on /mnt/vfat.
	[root@vortex livecd]# df -h		[root@vortex livecd]# df -h;
	Filesystem Size Used Avail Use% Mounted on		Filesystem Size Used Avail Use% Mounted on
	devtmpfs 5.9G 0 5.9G 0% /dev		devtmpfs 5.9G 0 5.9G 0% /dev
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	Unmount and Release loop device:		Unmount and Release loop device:
	[root@vortex livecd]# umount /mnt/vfat		[root@vortex livecd]# umount /mnt/vfat;
	[root@vortex livecd]# losetup -d /dev/loop0		[root@vortex livecd]# losetup -d /dev/loop0;

Rwh: /* How Do I Mount A Partition From A Disk Image Using: losetup? */

2020-05-12T19:40:25Z

How Do I Mount A Partition From A Disk Image Using: losetup?

← Older revision		Revision as of 15:40, 12 May 2020
Line 166:		Line 166:
	This section uses the '''[https://en.wikipedia.org/wiki/Loop_device losetup]''' command to help with mounting a partition within a disk image.		This section uses the '''[https://en.wikipedia.org/wiki/Loop_device losetup]''' command to help with mounting a partition within a disk image.

			List Partitions:
	[root@vortex livecd]# fdisk -l ./nst-minimal-32.x86_64.iso		[root@vortex livecd]# fdisk -l ./nst-minimal-32.x86_64.iso
	Disk ./nst-minimal-32.x86_64.iso: 1.17 GiB, 1247232000 bytes, 2436000 sectors		Disk ./nst-minimal-32.x86_64.iso: 1.17 GiB, 1247232000 bytes, 2436000 sectors
Line 179:		Line 180:
	./nst-minimal-32.x86_64.iso3 16644 54355 37712 18.4M ef EFI (FAT-12/16/32)		./nst-minimal-32.x86_64.iso3 16644 54355 37712 18.4M ef EFI (FAT-12/16/32)

			Create Loop Partitions:
	[root@vortex livecd]# losetup -P -f ./nst-minimal-32.x86_64.iso		[root@vortex livecd]# losetup -P -f ./nst-minimal-32.x86_64.iso
	[root@vortex livecd]#		[root@vortex livecd]#
Line 198:		Line 200:
	/dev/loop0p3 16644 54355 37712 18.4M ef EFI (FAT-12/16/32)		/dev/loop0p3 16644 54355 37712 18.4M ef EFI (FAT-12/16/32)

			Mount A Loop Partition:
	[root@vortex livecd]# mount -v /dev/loop0p3 /mnt/vfat		[root@vortex livecd]# mount -v /dev/loop0p3 /mnt/vfat
	mount: /dev/loop0p3 mounted on /mnt/vfat.		mount: /dev/loop0p3 mounted on /mnt/vfat.
Line 211:		Line 214:
	tmpfs 1.2G 4.0K 1.2G 1% /run/user/1000		tmpfs 1.2G 4.0K 1.2G 1% /run/user/1000
	/dev/loop0p3 19M 12M 7.2M 62% /mnt/vfat		/dev/loop0p3 19M 12M 7.2M 62% /mnt/vfat

			Unmount and Release loop device:
			[root@vortex livecd]# umount /mnt/vfat
			[root@vortex livecd]# losetup -d /dev/loop0

Rwh: /* How Do I Mount A Partition From A Disk Image Using: losetup? */

2020-05-12T19:37:50Z

How Do I Mount A Partition From A Disk Image Using: losetup?

← Older revision		Revision as of 15:37, 12 May 2020
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	/dev/loop0p2 180 16567 16388 8M ef EFI (FAT-12/16/32)		/dev/loop0p2 180 16567 16388 8M ef EFI (FAT-12/16/32)
	/dev/loop0p3 16644 54355 37712 18.4M ef EFI (FAT-12/16/32)		/dev/loop0p3 16644 54355 37712 18.4M ef EFI (FAT-12/16/32)

			[root@vortex livecd]# mount -v /dev/loop0p3 /mnt/vfat
			mount: /dev/loop0p3 mounted on /mnt/vfat.
			[root@vortex livecd]# df -h
			Filesystem Size Used Avail Use% Mounted on
			devtmpfs 5.9G 0 5.9G 0% /dev
			tmpfs 5.9G 0 5.9G 0% /dev/shm
			tmpfs 5.9G 1.5M 5.9G 1% /run
			/dev/mapper/vortex32-root 105G 26G 80G 25% /
			tmpfs 5.9G 0 5.9G 0% /tmp
			/dev/sda1 976M 222M 687M 25% /boot
			/dev/mapper/vortex30-root 53G 36G 18G 67% /NST30
			tmpfs 1.2G 4.0K 1.2G 1% /run/user/1000
			/dev/loop0p3 19M 12M 7.2M 62% /mnt/vfat

Rwh: /* How Do I Mount A Partition From A Disk Image Using: losetup? */

2020-05-12T19:35:50Z

How Do I Mount A Partition From A Disk Image Using: losetup?

← Older revision		Revision as of 15:35, 12 May 2020
Line 178:		Line 178:
	./nst-minimal-32.x86_64.iso2 180 16567 16388 8M ef EFI (FAT-12/16/32)		./nst-minimal-32.x86_64.iso2 180 16567 16388 8M ef EFI (FAT-12/16/32)
	./nst-minimal-32.x86_64.iso3 16644 54355 37712 18.4M ef EFI (FAT-12/16/32)		./nst-minimal-32.x86_64.iso3 16644 54355 37712 18.4M ef EFI (FAT-12/16/32)

			[root@vortex livecd]# losetup -P -f ./nst-minimal-32.x86_64.iso
			[root@vortex livecd]#
			[root@vortex livecd]# losetup -l
			NAME SIZELIMIT OFFSET AUTOCLEAR RO BACK-FILE DIO LOG-SEC
			/dev/loop0 0 0 0 0 /home/nst/dev32/livecd/nst-minimal-32.x86_64.iso 0 512
			[root@vortex livecd]#
			[root@vortex livecd]# fdisk -l /dev/loop0
			Disk /dev/loop0: 1.17 GiB, 1247232000 bytes, 2436000 sectors
			Units: sectors of 1 * 512 = 512 bytes
			Sector size (logical/physical): 512 bytes / 512 bytes
			I/O size (minimum/optimal): 512 bytes / 512 bytes
			Disklabel type: dos
			Disk identifier: 0x1877db0d

			Device Boot Start End Sectors Size Id Type
			/dev/loop0p1 * 0 2435999 2436000 1.2G 0 Empty
			/dev/loop0p2 180 16567 16388 8M ef EFI (FAT-12/16/32)
			/dev/loop0p3 16644 54355 37712 18.4M ef EFI (FAT-12/16/32)