If you changed the instance type to an instance built on the Nitro System, status checks fail if you migrated from an instance that does not have the required ENA and NVMe drivers. For more information, see Compatibility for changing the instance type.
GNU GRUB is a very powerful boot loader, which can load a wide varietyof free operating systems, as well as proprietary operating systems withchain-loading1. GRUB is designed toaddress the complexity of booting a personal computer; both theprogram and this manual are tightly bound to that computer platform,although porting to other platforms may be addressed in the future.
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Unfortunately, even OS device names are not always stable. Modern versionsof the Linux kernel may probe drives in a different order from boot to boot,and the prefix (/dev/hd* versus /dev/sd*) may change dependingon the driver subsystem in use. As a result, the device map file requiredfrequent editing on some systems.
Currently autogenerating config files for multi-boot environments depends onos-prober and has several shortcomings. Due to that it is disabled by default.It is advised to use the power of GRUB syntax and do it yourself. A possibleconfiguration is detailed here, feel free to adjust to your needs.
Since sendkey manipulates the BIOS keyboard buffer, it may causehangs, reboots, or other misbehaviour on some systems. If the operatingsystem or boot loader that runs after GRUB uses its own keyboard driverrather than the BIOS keyboard functions, then sendkey will have noeffect.
As you have seen in previous chapter the support matrix is pretty big and some of the configurations are only rarely used. To ensure the quality bootchecks are available for all x86 targets except EFI chainloader, Appleloader and XNU. All x86 platforms have bootcheck facility except ieee1275. Multiboot, multiboot2, BIOS chainloader, ntldr and freebsd-bootloader boot targets are tested only with a fake kernel images. Only Linux is tested among the payloads using Linux protocols.
The purpose of this License is to make a manual, textbook, or otherfunctional and useful document free in the sense of freedom: toassure everyone the effective freedom to copy and redistribute it,with or without modifying it, either commercially or noncommercially.Secondarily, this License preserves for the author and publisher a wayto get credit for their work, while not being considered responsiblefor modifications made by others.
We have designed this License in order to use it for manuals for freesoftware, because free software needs free documentation: a freeprogram should come with manuals providing the same freedoms that thesoftware does. But this License is not limited to software manuals;it can be used for any textual work, regardless of subject matter orwhether it is published as a printed book. We recommend this Licenseprincipally for works whose purpose is instruction or reference.
If you publish or distribute Opaque copies of the Document numberingmore than 100, you must either include a machine-readable Transparentcopy along with each Opaque copy, or state in or with each Opaque copya computer-network location from which the general network-usingpublic has access to download using public-standard network protocolsa complete Transparent copy of the Document, free of added material.If you use the latter option, you must take reasonably prudent steps,when you begin distribution of Opaque copies in quantity, to ensurethat this Transparent copy will remain thus accessible at the statedlocation until at least one year after the last time you distribute anOpaque copy (directly or through your agents or retailers) of thatedition to the public.
If your document contains nontrivial examples of program code, werecommend releasing these examples in parallel under your choice offree software license, such as the GNU General Public License,to permit their use in free software.
The FreeBSD boot loader requires either a primary or GPT partition.If all of the primary or GPT partitions are already in use, one must be freed for FreeBSD.To create a partition without deleting existing data, use a partition resizing tool to shrink an existing partition and create a new partition using the freed space.
src - The complete FreeBSD source code for both the kernel and the userland. Although not required for the majority of applications, it may be required to build device drivers, kernel modules, or some applications from the Ports Collection. It is also used for developing FreeBSD itself. The full source tree requires 1 GB of disk space and recompiling the entire FreeBSD system requires an additional 5 GB of space.
Once the disk is selected, the next menu prompts to install to either the entire disk or to create a partition using free space.If Entire Disk is chosen, a general partition layout filling the whole disk is automatically created.Selecting Partition creates a partition layout from the unused space on the disk.
Proper sector alignment provides the best performance, and making partition sizes even multiples of 4K bytes helps to ensure alignment on drives with either 512-byte or 4K-byte sectors.Generally, using partition sizes that are even multiples of 1M or 1G is the easiest way to make sure every partition starts at an even multiple of 4K.There is one exception: the freebsd-boot partition should be no larger than 512K due to current boot code limitations.
If the system hangs while probing hardware during boot or behaves strangely during the installation process, ACPI may be the culprit.FreeBSD makes extensive use of the system ACPI service on the i386 and amd64 platforms to aid in system configuration if it is detected during boot.Unfortunately, some bugs still exist in both the ACPI driver and within system motherboards and BIOS firmware.ACPI can be disabled by setting the hint.acpi.0.disabled hint in the third stage boot loader:
USB today provides a fast, bi-directional, low-cost, serial interface that offers easy connectivity to PCs. A hallmark for USB operation has been the ability for the host to automatically recognize devices as they are attached and install the appropriate drivers. With features such as backward compatibility with previous devices and hot "plug-ability", USB has become the de-facto standard interface for various consumer and PC peripheral devices. The USB standard allows up to 127 devices connected to a Host System. USB designates low, full, high-speed connectivity between devices compatible with the 2.0 specification. Most full speed devices include lower bandwidth mice, keyboards, printers, and joysticks. The use of high speed USB has exploded with the rapid growth in digital media in the consumer electronics market including media players, digital cameras, external storage and smart phones.
The role of the host controller (plus software) is to provide a uniform view of IO systems for all applications software. For the USB IO subsystem in particular, the host manages the dynamic attach and detach of peripherals. It automatically performs the enumeration stage of device initialization which involves communicating with the peripheral to discover the identity of a device driver that it should load, if not already loaded. It also provides device descriptor information that drivers can use enable specific features on the device. Peripherals add functionality to the host system or may be standalone embedded operation. When operating as a USB device, peripherals act are slaves that obey a defined protocol. They must react to requests sent from the host. It's largely the role of PC software to manage device power without user interaction to minimize overall power consumption. The USB 3.0 specification redefines power management to occur at the hardware level with multiple power states designed to reduce power usage across the IO system.
Partitions can only be resized into contiguous free space.Here, the last partition on the disk is the swap partition, but the second partition is the one that needs to be resized.Swap partitions only contain temporary data, so it can safely be unmounted, deleted, and then recreate the third partition after resizing the second partition.
FreeBSD uses the umass(4) driver which uses the SCSI subsystem to access USB storage devices.Since any USB device will be seen as a SCSI device by the system, if the USB device is a CD or DVD burner, do not include device atapicam in a custom kernel configuration file.
When used to restore data, restore stores temporary files in /tmp/ by default.When using a recovery disk with a small /tmp, set TMPDIR to a directory with more free space in order for the restore to succeed.
For SCSI tape devices, FreeBSD uses the sa(4) driver and the /dev/sa0, /dev/nsa0, and /dev/esa0 devices.The physical device name is /dev/sa0. When /dev/nsa0 is used, the backup application will not rewind the tape after writing a file, which allows writing more than one file to a tape.Using /dev/esa0 ejects the tape after the device is closed.
To mount an existing file system image, use mdconfig to specify the name of the ISO file and a free unit number.Then, refer to that unit number to mount it on an existing mount point.Once mounted, the files in the ISO will appear in the mount point.This example attaches diskimage.iso to the memory device /dev/md0 then mounts that memory device on /mnt:
Like the encryption of disk partitions, encryption of swap space is used to protect sensitive information.Consider an application that deals with passwords.As long as these passwords stay in physical memory, they are not written to disk and will be cleared after a reboot.However, if FreeBSD starts swapping out memory pages to free space, the passwords may be written to the disk unencrypted.Encrypting swap space can be a solution for this scenario.
The kernel doesn't support the filesystem on the device. If you compiled your own kernel, this is usually because you specified the filesystem driver should be built as a module rather than a native part of the kernel; if you're using the distro's kernel, this is usually because you picked an exotic format for your root filesystem. In either case, don't do that. 2ff7e9595c
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