Synonyms for sgpio or Related words with sgpio
Examples of "sgpio"
is essentially another (incompatible) application stack for SPI designed for particular backplane management activities.
uses 3-bit messages.
specification is maintained by the Small Form Factor committee in the SFF-8485 standard. The International Blinking Pattern Interpretation indicates how
signals are interpreted into blinking light-emitting diodes (LEDs) on disk arrays and storage backplanes.
signal consists of 4 electrical signals; it typically originates from a host bus adapter (HBA). iPass connectors carry both SAS/SATA electrical connections between the HBA and the hard drives as well as the 4
Applications that require a daisy chain configuration include
stream was intended for a low-cost implementation, and is limited to the capability of representing "activity", "locate", and "fail" LEDs.
became popular and adopted by HBA backplane and backplane vendors in 2004, and increasingly popular after the support by hardware manufacturers.
spec. is generally adopted and implemented in products from most major HBA and storage controller vendors such as LSI, Intel, Adaptec, Nvidia, Broadcom, Marvell Technology Group and PMC-Sierra. Most products shipping with support for SAS and SATA drives support this standard.
bus has a dedicated clock line driven by the initiator (its maximum clock rate is 100 kHz), although many implementations use slower ones (typically 48 kHz).
is typically used in conjunction with SAS or SATA cables, where each physical port is attached to a single disk drive.
The figure shows
for 4 drive slots (12 clocks), which is the minimum allowed. The
stream can be larger and it is not uncommon for the stream to consist of slot data for 12, 24 or 36 drives/slots in the case of an expander.
American Megatrends’ Backplane controllers, the MG9071 and MG9072 can used either SES-2 or
for enclosure management with a simple configuration selection.
There are 3 bits per slot (or hard drive) in the
specification. This section describes how each of these bits are interpreted according to the IBPI specification.
Although many hardware vendors define their own proprietary LED blinking pattern, the common standard for
interpretation and LED blinking pattern can be found in the IBPI specification.
has been adopted across the storage industry, and has in large replaced proprietary protocols such as SCSI Enclosure Services (SES) and SAF-TE.
These chips will receive 1 or 2
streams and drive LEDs accordingly; the latest chip from AMI, the MG9077, can be configured by pull-up and pull-down resistors to adopt to 16 different configurations of
buses and drive the LEDs accordingly. Since the availability of these chips from AMI, major OEMs including NEC, Hitachi, Supermicro, IBM, Sun Microsystems, and others are using them on their backplanes to receive the
streams from a variety of HBA vendors and on-board controller chips to consistently drive LEDs with a pre-determined blinking pattern.
In higher end systems initiators are capable of providing additional useful status information, such as rebuilding drives and predicted failures of drives. There was no standard for representing these conditions in the original
specification, at the same time as efforts were being made to elaborate a variety of additions to the standard by component vendors. This resulted in the IBPI specification, which uses blinking frequencies of bits in the
stream to represent additional states of drives.
The figure below shows the relationship between SClock, SLoad and the two data bits; SDataOut and SDataIn. An
frame is started after SLoad has been low for at least 5 SClock cycles.
Backplanes for SAS and SATA HDDs most commonly use the
protocol as means of communication between the host adapter and the backplane. Alternatively SCSI Enclosure Services can be used. With Parallel SCSI subsystems, SAF-TE is used.
Many SPI chips only support messages that are multiples of 8 bits. Such chips can not interoperate with the JTAG or
protocols, or any other protocol that requires messages that are not multiples of 8 bits.
"States" for drives or slots can be, for example, "empty", "failed", "rebuilding", etc. The "state" of a drive or slot is determined by the host bus adapter, and is typically transmitted to the backplane through
-signals on a cable.
bus consists of 4 electrical signals. It "originates" (or is driven by) an "initiator", typically a host bus adapter or SAS Expander, and arrives at a "target", typically a backplane.
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