scsi disk device vs ssd

please keep the original source at the beginning of the text: EMC Chinese Support ForumIntroducedHow many ways do Linux systems scan SCSI disks? Can I recognize a device without restarting the host after I have added a new LUN to Linux? What are the commands for dynamically adding/removing LUNs If PowerPath is installed? This article summarizes the way that Linux hosts reconfigure

Introduced How many ways do Linux systems scan SCSI disks? After Linux has added LUNs, can you recognize the device without restarting the host? If PowerPath is installed, what is the command to add/Remove LUNs dynamically? This article summarizes the way Linux hosts reconfigure disk devices and attaches command instances. More information The Linux system pro

pre-conditions:1. InstallationLSI's megacli package Megacli642. query tool for installing SCSI devices LSSCSI Apt-get Install LSSCSIsteps:1. Find the drive letter according to OsdidCeph-disk List |Grep-a 1-b 1 osd.0 | Egrep "^/dev/sd*\b" |cut-d ': '-f1 2. Find the device based on the drive letterTarget IDLsscsi | grep/dev/sdd | awk ' {print $} ' | cut-d ': '-f33.

When adding a SCSI hard disk to the server, you can let the system identify the new hard disk without stopping the server. The specific steps are as follows: Step 1: Insert the new hard disk to the machine; Step 2: run the command as the root user: Echo "scsi add-single-

Identification Disk (/SBIN/SCSI_ID) Oracle Linux 5 uses the following script: #！ /bin/shfor I in B c D E F g do echo "kernel==\" sd*\ ", bus==\" scsi\ ", program==\"/sbin/scsi_id-g-u-s/block/\ $na Me\ ", result==\" '/sbin/scsi_id/block/sd$i ' \ ", name=\" asm-disk$i\ ", owner=\" grid\ ", group=\" asmadmin\ ", MODE=\" 0660\ "" Oracle Lin

Sd.cStaticvoidsd_config_discard (structscsi_disk*,unsignedint); staticvoid sd_config_write_same (structscsi_disk*); Staticintsd_revalidate_disk (struct gendisk*); staticvoidsd_unlock_native_capacity (structgendisk*disk); static intsd_probe (structdevice*); Staticintsd_remove (struct device*); Staticvoidsd_shutdown (structdevice*); Staticintsd_suspend ( structdevice*); Staticintsd_resume (structdevice*); sta

the characteristics of traditional disk, so we use SSD, the software level of the technology adopted will be changed, which we can glimpse from the Linux open source project. For example, Linux adds the trim mechanism for SSD and requires modifications to the Scsi,io-schedule,md-raid and file systems to enhance

Some time ago in developing a system that uses SSD for caching, a large amount of disk caching occurs when writing data at high speed. Too much disk caching is very dangerous if there is a problem with the machine if it is not written to disk in a timely manner, which can result in a lot of data loss, but if the data i

HDD (Hard Disk Drive)Disksim3.0 (HDD simulation)A model developed by CMU that contains many storage components: it is written in C language and has a code volume of about 60 thousand lines. About Disksim What does DiskSim Does?Disksim is an efficient, accurate, and highly configurable Disk System Simulator written by c and open-source. It has a variety of modules, such as

perhaps SSD (solid state Drive) compared to the mechanical hard drive, the speed rise is really fierce, the computer boot to enter the system from the minute to the full turn into seconds reading time. In fact, the benefits of SSDs is not only in the speed of change, if only hundreds of yuan investment in exchange for these, it is too young! SSD structure is relatively simple, there is no rotating disc, ma

If you are using or preparing to buy SSD, you will certainly have some understanding of it. Now because the structure of solid-state hard disk and mechanical hard drive are fundamentally different, solid-state drives to achieve real performance needs of the trim instructions and other special means. But most people do not know, or are not aware of, in addition to some newer solid-state hard drives, partiti

In vSphere 5. x adds a new vSAN feature. However, this feature requires at least one SSD on the physical machine as the cache, and requires no Raid or the Path-Thru feature of the Raid card to be enabled. However, some RAID cards do not have the Path-Thru function, or the server does not have SSD. This method can be used to fool vSphere and forcibly mark a disk t

First, view the SSD cloud disk sudo fdisk-l disk/dev/vda:42.9 GB, 42949672960 bytes, 83886080 sectors Units = sectors of 1 * the bytes sector size (logical/physical): bytes/512 bytes I/o size (minimum/optimal): bytes/512 bytes Disk LA Bel type:dos Disk iden