A trailing slash on the source avoids creating an additional directory level at the destination.
rsync -a src/ destYou can think of a trailing / on a source as meaning "copy the contents of this directory" as opposed to "copy the directory by name".
rsync -a -P src dest
rsync -a --progress src destLots of ants try to find food at my home, what do they like to eat? They don't like to eat raw food, such as banana, uncooked rice, etc. but they like to eat cooked food. They don't like milk pouder, but they like milk.
So what do ants eat in nature?
Table of Contents
Be happy, there are many ways to satisfy yourself, just listed them below.
Things always have two views, positive and negative, thinking positively.
Big achievements accompany too many failures, they are always bulit up by many small achievements.
Work for others is called work, work for yourself is called contribute.
Lesser rules applied.
Nothing is the best.
Building hobbies
Less worry later
Don't worry too much about future
Just say hi to others during exercise can help yourself forget tiredness.
Bring you out of depression.
Don't always follow
If impossible, go out and watching others
To forget whatever happened before.
Don't try to recall sad things although they can't be forgotten.
Don't believe people said, just listen.
User home directory can be integrated to Microsoft Onedrive.
After convert user home directory to Onedrive, all Windows machines can share the same profile.
Some old software still looking for old home directory in System drive, such as Baidu Cloud.
Table of Contents
Some core files are in the executable file running directory, some core files are in system directory, depending on the system configuration.
By default, the core file name is core only, different OSs change it's name.
Abrt stores core files in /var/cache/abrt.
Apport stores core files in /var/crash.
Systemd updated /proc/sys/kernel/core_pattern as below.
$ cat /proc/sys/kernel/core_pattern
|/usr/lib/systemd/systemd-coredump %p %u %g %s %t %eThe core files in Linux can be found in /var/db/system/cores/, they can be removed if no debugging required.
Fedora store core files in /var/spool/abrt/ instead
Archlinux stores core files in /var/lib/systemd/coredump/
Table of Contents
FreeNAS/TrueNAS Core is using FreeBSD OS, which doesn't support docker and KVM, it uses bhyve as Hyperviser. In order to use docker, requires VM to be installed, such as Rancher OS VM, which is an overhead of the system.
TrueNAS Scale is developed under Debian, and which is still under beta version. In order to use more features under virtualization, TrueNAS Scale is considered to be used.
Installation of TrueNAS Scale is slower than TrueNAS Core, network configuration is different too.
Network aggregation configuration for failover, could not select active and stand by interface. Need to find out more on this configuration.
ZFS pool can be installed easily.
To change the pool name, can use shell to import and export before use GUI import. Following commands can be used
zpool import pool_old pool_new
zpool export pool_newzpool import pool_new
zfs rename old_name new_name
zpool export pool_newThe BSD hypervisor, bhyve, pronounced "beehive" is a hypervisor/virtual machine manager available on FreeBSD, macOS, and Illumos.
FreeNAS® VMs use the bhyve(8) virtual machine software. This type of virtualization requires an Intel processor with Extended Page Tables (EPT) or an AMD processor with Rapid Virtualization Indexing (RVI) or Nested Page Tables (NPT).
To verify that an Intel processor has the required features, use Shell to run grep VT-x /var/run/dmesg.boot. If the EPT and UG features are shown, this processor can be used with bhyve.
To verify that an AMD processor has the required features, use Shell to run grep POPCNT /var/run/dmesg.boot. If the output shows the POPCNT feature, this processor can be used with bhyve.
Fusion Pools are also known as ZFS Allocation Classes, ZFS Special vdevs, and Metadata vdevs.
A special vdev can store meta data such as file locations and allocation tables. The allocations in the special class are dedicated to specific block types. By default, this includes all metadata, the indirect blocks of user data, and any deduplication tables. The class can also be provisioned to accept small file blocks. This is a great use case for high performance but smaller sized solid-state storage. Using a special vdev drastically speeds up random I/O and cuts the average spinning-disk I/Os needed to find and access a file by up to half.
Go to Storage > Pools, click ADD, and select Create new pool.
A pool must always have one normal (non-dedup/special) vdev before other devices can be assigned to the special class. Configure the Data VDevs, then click ADD VDEV and select Metadata.
Add SSDs to the new Metadata VDev and select the same layout as the Data VDevs.
Using a Mirror layout is possible, but it is strongly recommended to keep the layout identical to the other vdevs. If the special vdev fails and there is no redundancy, the pool becomes corrupted and prevents access to stored data.
When more than one metadata vdev is created, then allocations are load-balanced between all these devices. If the special class becomes full, then allocations spill back into the normal class.
After the fusion pool is created, the Status shows a Special section with the metadata SSDs.
Auto TRIM allows TrueNAS to periodically check the pool disks for storage blocks that can be reclaimed. This can have a performance impact on the pool, so the option is disabled by default. For more details about TRIM in ZFS, see the autotrim property description in zpool.8.
SSD cache helps accessing same set of files frequently. But if the system just holding media files, most likely they won't be visited again, then cache doesn't help.
RAM is required for SSD cache, but adding RAM is more directly impact the perform, because there is no duplication between harddisk and SSD.
The required amount of RAM is calculated before cache created.
One SSD disk only can be configured for one volume in read-only mode.
Two or more SSD disks can be configured as one raid, for one volume in read-write mode.
Currently, one SSD disk or raid can not be partitioned for different volume.
Others suggest 64GB or more of RAM before adding a cache, otherwise, will slow the system down if add a cache with 16GB RAM.
Fusion disk could be another choise because the SSD can be used as storage as well, no waste of space.
Rancher 2 exclusively deploys and manages Kubernetes clusters running anywhere, on any provider.
Commands and Options
Set up Docker on FreeNAS 11.2 - Part 1 - RancherOS VM
Setting up Docker on FreeNAS 11.2