840 evo read write speed

In terms of overall performance (data security and speed), RAID5 is certainly better; in terms of Data Reading, raid1 is the fastest; in terms of data security, raid1 is the best; in terms of data writing, raid0 is the fastest. RAID5 has both these advantages. Understanding disk array raidI. Functions1 high-speed disk access (acceleration): Raid forms a disk array of General hard disks and writes data to t

Sometimes when we do maintenance, there will always be similar to the IO is particularly high, but can not be determined to be an IO bottleneck or improper setting of software parameters caused hot disk problems. This is usually the time to know the disk read and write speed, to make the next decision.Here are two methods of testing:(1) using the Hdparm commandTh

The current mode of mechanical disk operation, mainly reflected in the disk reading and writing to find the track of the process, the disk caching function for reading and writing speed is very important. Disk search process is a mechanical way, so that its random speed is significantly lower than the sequential reading and writing, generally ordinary disk IO can reach 40--60MB per second, slightly better w

When we use the computer, we often encounter a copy of the file to wait a few 10 minutes. This makes a lot of users feel very distressed. Therefore, everyone is very concerned about how to improve the speed of Mac read and write? Here we will introduce to you.Figure One: IconsSmall partners who have used Mac computers know that Macs can't

Today put a 4G file to my memory Czech 8G, the old said the disk is full, on Baidu asked, just know to be converted to NTFS, FAT32 file Max 2G. But this toss, found a knack, incredibly can manually lift U disk into write 23mb/s read 33m/s Super high-speed! 1: In the NTFS system, format the U disk, the allocation unit size can not be greater than 4k.

Test Drive read/write speed tools/materials with/dev/zero and/dev/null ubuntu14.04 Dd Baidu Experience: jingyan.baidu.comMethod/Step 1First we need to understand/dev/null and/dev/zero two files, we open two files respectively,650) this.width=650; "class=" Exp-image-default "alt=" use/dev/zero and/dev/null to test HDD

1, first familiar with two special equipment:(1)/dev/null: Recycle Bin, bottomless pit.(2)/dev/zero: produces characters.2. Test disk write capabilityCopy the Code code as follows:Time DD If=/dev/zero of=/testw.dbf bs=4k count=100000Because/dev//zero is a pseudo-device, it produces only a stream of empty characters, it does not produce Io, so the IO is concentrated in the of file, the of file is used only for writing, so this command is equivalent to

Command: hdparm-t device name (/dev/sda1) Write speed command: time dd if =/dev/zero of =/tmp/test. dat bs = 1G count = 1 Test disk read/write IO speed Sometimes, during maintenance, we always encounter a problem similar to IO, but it cannot be determined whether it is an I/

Sometimes when we do maintenance, there will always be similar to the IO is particularly high, but can not be determined to be an IO bottleneck or improper setting of software parameters caused hot disk problems. This is usually the time to know the disk read and write speed, to make the next decision. (1) Use the hdparm command this is a command to get the par

Sometimes, during maintenance, we always encounter a problem similar to Io, but it cannot be determined whether it is an I/O bottleneck or a hot disk caused by improper configuration of software parameters. at this time, we usually want to know the read/write speed of the disk for further decision-making. The following are two test methods: (1) Use the hdparm com

Time has a timing function, DD is used for copying, read from If, write to of. If=/dev/zero does not produce IO, so it can be used to test write speed. Similarly of=/dev/null does not produce IO and can be used to test the read speed