Portmap is a service that converts RPC program numbers into protocol port numbers. It must be running in order to make RPC calls. Portmap makes the dynamic binding of remote programs possible. NFSv3 is based on portmap. We will dive into this today. How Portmap works? The portmap service maps RPC service and version numbers …
Storage
The rpcbind is a utility that converts RPC program numbers into universal addresses. It must be running on the host to be able to make RPC calls. We will dive into RPCbind today to see how it works. Understanding RPC Remote Procedure Call (RPC) is an inter-process communication technique to allow client and server software …
Network File Sharing (NFS) is a protocol that allows us to share directories and files with other Linux clients over a network. The ports for NFS are confusing for many people. We will deep dive into this today. NFSv3 Port NFSv4 Port NFSv3 Port NFSv3 and NFSv2 include portmapper, nfsd, and other NFS services like …
This article is part of the following series. 6 performance tools you should know in Linux 5 Ways to Check disk size in Linux 4 Ways to Check Disk Partition with Examples in Linux How I Fixed a disk performance issue in Minutes – A Step by Step Guide to Optimize Linux System Linux …
Timeo is a timeout mount option in NFS mount. It is the timeout value that the NFS client uses to wait for a response before it retries an NFS request. Let’s dive into the details about what this timeout value means between NFS over TCP and NFS over UDP. Check this post to learn more …
File system is an important part of Linux world. We collect 10 useful file system concepts below to help you understand what file system is. Important File system Concepts File system: An organization of data as files and directories, with a file-based interface for accessing them, and file permissions to control access. Additional content may …
Raw IO and Direct IO are both bypassing file system cache. Here are more details about these two IOs. This can help us understand the difference and troubleshoot easier when we get a file system issue. Difference Between RAW IO and Direct IO Raw I/O is issued directly to disk offsets, bypassing the file system …
This article is part of the following series. 6 performance tools you should know in Linux 5 Ways to Check disk size in Linux 4 Ways to Check Disk Partition with Examples in Linux How I Fixed a disk performance issue in Minutes – A Step by Step Guide to Optimize Linux System Disk …
Linux IOwait is a common Linux performance issue. Today we will look at what iowait means and what contributes to this problem. Hope this can give you more ideas about high IOwait issue. IOwait on Linux The iowait column on top command output shows the percentage of time that the processor was waiting for I/O …
How to get HBA WWPN on Linux is a common task for a storage engineer. We need the WWPN to configure zone on the switch side.We will look at this question today. In our SAN environment, we have two HBAs installed on the Linux system. We can get the HBA WWN/WWPN using the following way …