Summary: In the storage array, generally utilize slab approach to get in touch the hard disk, by doing this the node could modify the rotten hard drive directly with affliction in which shut down. Adopt SAF-TE to overpower engineering instead of basically handle the quality of the hard drive in the piece pattern at any time, present LED with regard to spoiled hard drive to indicate plus call the actual police, can certainly as well recognise the actual real-time following involving lover in the system, temperatures as well as voltage for the identical time. This word will administer SAF-TE command apparatus GEM318 when examples, will suggest the idea in order to plug the seller's application from the slab pattern throughout warm of start 2U device very difficult disk. Keyword: SAF-TE; GEM318; I2C; PCB redirecting " >PCB routing
SAF-TE manipulate technique SAF-TE (SCSI Accessed Fault-Tolerant Enclosure) It is often a sorts of ordinary in which Intel Company puts forward. This standard features characterized an organization command, your these kinds of command line may be used to get setting up RAID assortment plus obtaining this standing information of the permanent magnetic disc throughout that array, although knowing plus pushing the magnet disc to heating along with taking about management, give your environment rank tips in the storage range for you to user. Set up in force verbal exchanges path among sponsor computer, RAID manage device, storage equipment, slab, electricity and other apparatuses in this way. Compared with earlier slab, follow SAF-TE for you to manage the technical warmth in order to plug the actual slab, have this advantages: Can control in addition to outlet the status facts of which discloses the actual disk drive inside warm around the bottom part -panel that car owner sta te. This allow client affirm plus change just one witout a doubt useless drive travel that's as well as might be outside of purchase fast. After transforming the spoiled hard disk, the rebuild connected with RAID can certainly go on automatically, nonetheless needn't handle in addition to shift as well as work RAID manage gadget to be able to finish. In healing period of the very difficult disk, will not have an impact on your systematic service. Without SAF-TE, automated rebuilding can become finished in the reputation of quit magnetic disc. Because should not should place the quit magnetic disc from the array, can comprehend the maximization of the amount of this convenient over unity magnetic disc from the file array when using SAF-TE.
Circuit design GEM318 may be a very low cost, plugs your hard disk drive piece to regulate your manage device with the finish heat, merely have in order to recognize SAF-TE boss function using simple peripheral device. Because its low-cost along with minor encapsulated characteristic, allow it to be turn into first-selected answer in nodal slab style associated with 1U in addition to 2U server. The circuit style and design GEM318 associated with the electronics includes LVDS interface, we know to be a goal tool with SCSI, and also accounts for a ID quantity and also encourages SAF-TE 1.0 norm. Have interface associated with one I2C, once the function was in the get better at mode, can easily study the configuration data included in the external heat sensor LM75 and also NVRAM AT24C01. Support eight SCSI apparatuses from most, 8 LEDs command the actual pin. Support two LM75 temperature sensors, pattern this routine to be found as in Fig. a single specifically. The hard disk drive plugs and also measures this slab with supporting some SCSI challenging disks, need, partners 6 your intersection associated with SCSI plus MATED pin number regarding slot to be able to piece independently DEV_INS5 of GEM318 0 a few pin these only. It will be high grade until this pin number is usually normal, as soon as it is definitely introduced that there are actually tough disks in the certain trough, MATED pin on the hard disk drive will certainly pull that similar DEV_INS flag degree low. In the following way, GEM318 come, judge each SCSI drive plug this state around the slot reported by this. After GEM318 registers the specific DEV_INS pin appears from excessive in order to lower levels jump transfer, could help that reset indicate upon SCSI bus series immediately, help to make SCSI apparatus around reset state (show as in Fig. 2) . In with this logical " Shield " Meddle in hard drive twinkling of your observation interference on SCSI Bus Signals,it last SCSI this dependability transmissions of this Bus Signalses. Fault alarm in addition to LED might transmit the actual miscalculation data that will SAF-TE control register is definitely noted to labelling that police to be able to upload the pin FAULT_IN with time to indicate GEM318. In this particular way, GEM318 can announce the particular malfunction message to customers by using sound in addition to easy alarm at any kind of time. In the design the particular logical expenditure connected with the actual temperature, fan plus detection circuit associated with voltage, your outside the house problem of inputting the computer chip of the AND-gate and exporting that will GEM318 as a result of 7411 about three inputs the pin G_ALARM (low grade effectively) ,In order to realize the objective of curbing data of perform environment. LED7 exports the pin 0 in order to travel external LED, unveils your hard disk drive status details corresponded to separately. LVDS transmission interf ace and ID developed GEM318 plus assist LVDS signal program way, LVDS is the electric-current operating mode, the low-voltage excursion regarding 350mV typically offer numerous megabits regarding signal tranny rates. Using the particular transmissive technique of your differentiating help make electromagnetic disturbance cancel every single others, dispel the noises belonging to the frequent mode, lower EMI. Two IDs can be purchased of which generally there is GEM318: ID6 or even ID8. The goal is due to order that will when that drive of an SCSI passway inside the plate burst is counted to exceed 8, can certainly adopt two GEM318s. When them style ID_ON1 GEM318 + /last DB6 + / DB6- of SCSI along at the bus ranges ID_ON1-, often be lasted a few ID symbolic representation of GEM318. Have very good layout overall flexibility through electronics circuit jumper wire and NVRAM configuration GEM318GEM318, can home the actual quality involving GEM318 through looking through along wi th outputting your data around stage assert in addition to NVRAM in the pin while in electricity up. LED7 functions when punching in that flag at time period whenever RESET signal regarding GEM318 is actually valid 0 pins while in systematic electrical power up. Require RESET transmission to help keep some clock fertility cycles at least. LED7 is identified from pulling upward or maybe pull-down resistor while being created 0 electrical power up pin level of primary stage, need to be able to drive LED expicity electric electric power provide LED_VDD in order to hold off providing power while in this, making sure that GEM318 can certainly study the internet with exact lower level. Electric this intersection of time along with t can determine as a result of correct C31 and benefit with R22 at LED_VDD delay. Design the enterprise being demonstrated such as Fig. 3, electrical power sequence is definitely proven as with Fig. 4. It appeared to be AT24C01 that NVRAM chose whilst de signing, GEM318 will certainly read data from 40H memory cell of AT24C01 the moment connected with strength up. Through can certainly established up this in addition to select to AT24C01 programminging: The quantity associated with Slot, SCSI ID availablility of just about every Slot, set up may be your temps sensor and upper along with lower limit of temperatures alarm,etc.. Serial conversation designs this compatible I2C tradition involving serial communication software of GEM318, can do the job and can also function under the get good at manner out of the actual way. The work could help support the principle opposition extra below this control mode, reserve I2C pin within the slab design, it is possible in this for you to give for any actuality that this manage machines from the department went to information associated with information. When this operate can be through the way, you'll find a pair of GEM318 out of available address. Receive ID_ON1 within SCSI bus line whi lst designing, the particular placing because E1H through the tackle regarding GEM318. If it can be E3H to be able to acquire ID_ON0 in the bus line from the address. PCB design the slab in order to need to support transmission rate connected with SCSI bus distinct 320Mbps, SCSI bus tier adopts LVDS signal tranny technology, to be able to confirm that reputable transmission involving this signal, PCB routing " >PCB redirecting is actually essential. The primary specialised parameter with the seen registration is usually while follows: 1. The measurement is actually 270mm X 84mm, that plate width is definitely 2mm. 2. Adopt five plywood to be designed, the entire agreement out of leading levels to underside layer on the signal is usually successively that TOP layer, the particular GND layer, 1 storey connected with signals, a couple of storeys of signals, 3 storeys connected with signals and also BOTTOM layer. a couple of layers of cloth 12V power with sign involving them, 3 tiers associated with signs propagate 5V power. Should focus on your subsequent many points around routing: 1. Pay the most particular attention towards the strength when using the distribution while in the system. 2. Enable TTL mark as well as LVDS indication isolate, is definitely preferably handed out on numerous floors. 3. Try difficult make use of as well as decouple capacitively more. 4. The routing of superb latest world attempts tricky to include thickly, hold PCB ground line one level of return routes attempting tough to often be large as well as short. 5. Adopt the guide book routing perform in respect of this supply line of difference, make the series set of your differentiating near 1 another up to doable once making your included chip. Want give difficult just about every pair differentiating light interval,differentiating for you to amid duration are not capable of match. It is the actual disturbance in the popular setting to be able to lower the noise reflecte d and can ensure to be combined to. 6. Control impedance, calculate impedance is in obtain in order to verify tier width in the differentiating and line phase through this impedance design software. 7. Design the actual circuit with the terminator for the slab, in order to digest the actual reflected signal. 8. Avoid 90?? is frosty even though redirecting Does not ???? possess furan of ? the striking table spoon Ma melt collectively your garden have problems with waterlogging? Does 5? complete ji ? Jin? Concluding the speech adopts SAF-TE to manipulate SCSI backplate associated with technical design, provides already applied to your series of merchandise with the dawning extensively. Through the specific motion with more than a couple years, confirm procedure do the job reliable, this trait is steady, have got certain temperature plugs the particular safety firm operation of the very difficult disk. The ownership from the things with technique of the following control techni que, can certainly only control temp in addition to buff details to be able to stopper that slab soon after switching that traditional heat, problem that can't direct particular computer, the hard disk drive controller. Have offered this appropriate confirm pertaining to safety measures firm operation from the storage space method with the server.
Bibliographical reference point 1 SCSI Accessed Fault-Tolerant Enclosures Interface as well as Specification2 GEM318 Guardian Enclos ure Management Controller Data Sheet3 GEM318 Guardian Management Controller Technical Manual
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