If you are attempting to unmount a NFS command like
# mount -t nfs -o remount /mnt/nfs # umount /mnt/nfs # umount -f /mnt/nfs # umount -l /mnt/nfs # umount -lf /mnt/nfs
Identify which processes tied to the mount need to be killed by using lsof and fuser:
# lsof | grep /mnt/nfs
lsof command above identifies the PID of the processes associated with the /mnt/nfs share. Kill any processes locking the stale mount.
Try to force umount again after the processes as been killed
# umount -lf
References:
In quarterly earnings reports this year, the CEO and founder of NVIDIA (a Liqid partner) noted that its recent advancements in delivering its new compute platform designed with AI in mind and its acquisition of a leading networking company this year are all designed to achieve the central goal of advancing what is increasingly known as data center-scale computing. For providers of high-performance computing solutions, both those built around NVIDIA’s tech and those that are competing with the GPU goliath, this need for data center-scale computing has been defined by and escalated alongside the data performance requirements of artificial intelligence and machine learning (AI+ML), something I discuss further in a recent article.
From Science Daily
Computer scientists developed a deep learning method to create realistic objects for virtual environments that can be used to train robots. The researchers used TACC’s Maverick2 supercomputer to train the generative adversarial network. The network is the first that can produce colored point clouds with fine details at multiple resolutions.
https://www.sciencedaily.com/releases/2021/01/210119194329.htm
Lee Bushen, NVIDIA Solutions Architect, gives you a walk-through of the installation process for NVIDIA Virtual GPU on VMware vSphere and Citrix Hypervisor (XenServer).
You can check location of libraries with ldconfig. For example, if you are looking for libffi
% ldconfig -p | grep ffi
libffi.so.6 (libc6,x86-64) => /lib64/libffi.so.6“-p” – Print the lists of directories and candidate libraries stored in the current cache.
RapidFile Toolkit 1.0 (formerly, PureTools) provides fast client-side alternatives for common Linux commands like ls, du, find, chown, chmod, rm and cp which has been optimized for the high level of concurrency supported by FlashBlade NFS. You will be
For CentOS/RHEL
# sudo rpm -U rapidfile-1.0.0-beta.5/rapidfile-1.0.0-beta.5-Linux.rpm
Examples:
Disk Usages:
% pdu -sh /scratch/user1
Copy Files:
% pcp -r -p -u /scratch/user1/ /backup/user1/
Remove Files:
% prm -rv /scratch/user1/
Change Ownership:
% pchown -Rv user1:usergroup /scratch/user1
Change Permission:
% pchmod -Rv 755 /scratch/user1
References:
nconnect is included in linux kernel versions >= 5.3. What is nconnect? nconnect enables multiple TCP connections for a single NFS mount. It is easy to implement
At /etc/fstab
mount -t nfs -o rw,nconnect=16 192.168.1.0:/applications /user/localFor more information, do take a look at Session Trunking for NFS available in RHEL-8
References:
If you doing a yum update or yum install for CentOS 6. You might face the error:
Setting up Upgrade Process YumRepo Error: All mirror URLs are not using ftp, http[s] or file. Eg. Invalid release/repo/arch combination/ removing mirrorlist with no valid mirrors: /var/cache/yum/x86_64/6/base/mirrorlist.txt Error: Cannot retrieve repository metadata (repomd.xml) for repository: base. Please verify its path and try again
This is because YUM repository was removed from the main CentOS update servers. As a result, no security or feature upgrades are provided.
Where are these obsolete Yum Repository now? They are found in CentOS Vault Repository. To use the Vault repository, set up its repo configuration instead of the now defunct repositories configuration:
# curl https://www.getpagespeed.com/files/centos6-eol.repo --output /etc/yum.repos.d/CentOS-Base.repo
You may want to edit CentOS-Base.repo directly. My OS is CentOs 6.9
..... ..... [base] name=CentOS-$releasever - Base #mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=os&infra=$infra #baseurl=http://mirror.centos.org/centos/$releasever/os/$basearch/ baseurl=https://vault.centos.org/6.9/os/$basearch/ enabled=1 gpgcheck=1 gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-6 #released updates [updates] name=CentOS-$releasever - Updates #mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=updates&infra=$infra #baseurl=http://mirror.centos.org/centos/$releasever/updates/$basearch/ baseurl=https://vault.centos.org/6.9/updates/$basearch/ enabled=1 gpgcheck=1 gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-6 #additional packages that may be useful [extras] name=CentOS-$releasever - Extras #mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=extras&infra=$infra #baseurl=http://mirror.centos.org/centos/$releasever/extras/$basearch/ baseurl=https://vault.centos.org/6.9/extras/$basearch/ gpgcheck=1 gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-6 #additional packages that extend functionality of existing packages [centosplus] name=CentOS-$releasever - Plus mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=centosplus&infra=$infra #baseurl=http://mirror.centos.org/centos/$releasever/centosplus/$basearch/ gpgcheck=1 enabled=0 gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-6 #contrib - packages by Centos Users [contrib] name=CentOS-$releasever - Contrib mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=contrib&infra=$infra #baseurl=http://mirror.centos.org/centos/$releasever/contrib/$basearch/ gpgcheck=1 enabled=0 gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-6
For EPEL Repository
# curl https://www.getpagespeed.com/files/centos6-epel-eol.repo --output /etc/yum.repos.d/epel.repo
For SCLO repositories
# curl https://www.getpagespeed.com/files/centos6-scl-eol.repo --output /etc/yum.repos.d/CentOS-SCLo-scl.repo # curl https://www.getpagespeed.com/files/centos6-scl-rh-eol.repo --output /etc/yum.repos.d/CentOS-SCLo-scl-rh.repo
References:
The Linux Cluster 