Tler of hard disk parameters

"You have no idea what the NAS disk is for, and to be precise, the NAS disk is going to be tler technology, so it fits on the NAS," he said. tler=time-limited Error Recovery So to speak, ordinary hard disk (without TLER), if read a block of data can not read, will try to read the data block 30 seconds-1 minutes, and then can't read it, mark this data block for the bad word, storage no longer. In this 30-second-1-minute attempt to read time, the hard drive is unresponsive to the outside world, which is why you sometimes open the resource manager and show that the response is lost. Most hardware RAID array systems, when the hard drive loses its response for 3-5 seconds, will determine the hard drive failure and kick It out of the array. In this case, obviously a hard drive with a small bad path, but because in 30 seconds-1 minutes of the attempt to lose the response, was kicked out of the array. Rebuilding the array is not a problem, and if a disk is really broken during the rebuild, your data will be tragic. So the NAS dedicated hard disk, enterprise-class hard disk has the role of Tler,tler: When the hard disk read a block of unreadable, just try to read 3-5 seconds (this time limit can be set in the firmware), and then not read it immediately mark this chunk as bad, and report to the RAID array, Read data from other redundant disks to reconstruct this small subset of the array data. Tler greatly reduces the drop-off rate of RAID arrays, improves reliability and stability, and any hardware NAS must be equipped with Tler hard drives. Summary 2 words: 1, with Tler NAS West number WD, absolutely can not be used on ordinary desktop computers, including the motherboard's own RAID array. Because the desktop and motherboard self-contained arrays do not support Tler, your data is flagged as unsuccessful after 3 seconds of attempted reading. 2, in the hardware NAS, such as array cards, or dedicated integrated NAS (Synology and the like), must have a hard drive with Tler. Otherwise the reliability will be greatly compromised. ”

Tler of hard disk parameters