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In this user guide, we will uncover some of the possible causes that may indicate the occurrence of a conditional loyalty condition, and then we will suggest possible fixes that you can try to solve this problem. If a native target returns a test condition in response to a command, it means that it has entered a fully dependent membership condition. This means that an error occurred while trying to execute the SCSI command. The initiator then typically issues a large SCSI Request Sense command to obtain a Key Code Qualifier (KCQ) from the target.
The SCSI computer connection detects a conditional match even if the SCSI device reports an error.
A SCSI conversation occurs between an initiator and a target of any type. The initiator sends a request to the target, which then responds. At the end of the command, each target returns a status code byte, which is typically 00h for success, 02h for a test condition (fail), or 08h for busy.
Typically, when a target returns a test condition in response to a command, each initiator issues a SCSI discovery command to obtain additional information. During the time between the credit check status report and the issuance of the Request Sense command, attention is in a special state called a group, a loyalty condition.
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While the target is in conditional loyalty, it must be maintained by suspendingto collect information related to any failure that caused it to enter this state.[1] This can be a proposal set in configurations that contain more than what the initiator is. A well-designed target will be able to collect data from one initiator while simultaneously processing commands from another initiator. Thus, when the status of a probe needs to be communicated to an additional or third initiator, it can become extremely difficult. The SCSI definition underlying the conditional validity condition allows the control itself to override the response to new commands and suspend processing of any new commands still in the enterprise’s execution queue.
Events that may result in another target being included in a quota loyalty scenario,
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- Target responds to SCSI command with test condition 02h
- Target responds to SCSI command with command termination 22 hours
- An unexpected breakup
Events that can cause the intended target to lose conditional loyalty health:
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- Hard Reboot Target
- The target receives a strong cancel message.
- The target receives a bus device adaptation message.
- Target will receive any valid initiator command
Extended Precision Conditional
What is a contingent allegiance condition?
If the target returns a test condition in response to a command, this simply indicates that it is entered into a fully dependent membership condition. This means that a fatal error occurred while trying to execute a single SCSI command. The initiator then typically uses the SCSI Request Sense command to obtain a Key Code Qualifier (KCQ) from the target.
If the target has to go through a lengthy debugging process (usually more than a second), the idea can result in an extended quota loyalty error. This may be necessary in increasingly powerful systems or in cases where there is currently a risk that the initiator will reset the target after a short delay, thereby lengthening the interval and interrupting the error recovery procedure. As with conditional consent, the sad victim is allowed to use a busy response to incoming commands and suspend processing of any new commands that are still queued to be executed.
If a target enters an extended loyalty quota state, it will most likely send an Initiate Recovery message to the initiator.
How does the inquiry command work with contingent allegiance?
When a REQUEST command is issued from the initiator to a logical device with a pending unit attention disorder (before the target generates a conditional loyalty condition), your target must complete the REQUEST sale and not extinguish the unit’s curiosity.
SCSI events that can cause a particular target to exit an extended condition About dependent membership,
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- Target receives reset from bus device
- Target gets hard reset
- The target receives a version restore message from the corresponding initiator
Links
- SCSI status code
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The SCSI status code is typically used to determine the success or failure of a
SCSI command. At the end of any command line, the target returns a brand new status code, which must be one of the following: 00h OK
02h Check condition< /p>< p>If this target returns a test condition when the command returns, it indicates that it has entered a loyalty-dependent state. This means that an error occurred while trying to execute the SCSI command. The initiator then typically issues a SCSI Request Sense command to look up a key code qualifier (
KCQ ) from that target.Condition 04h met
This status code is returned on success fetch command or co Prefetch response.
08h Busy
The target returns Busy if its command cannot be executed at that time, for example, just like in a conditional connection condition.
p>
10h Intermediate
Target returns “Intermediate” when find finishes binding a command.
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12h data underrun/overrun?
Underrun/overrun data ?
Intermediate condition 14h – met
As the name implies, this is just the last combination of intermediate condition 10h and 04h.
Reservation conflict 18h
< p>The target returns this step if the initiator tries to acquire a trusted trusted LUN previously reserved and also by another initiator. ur with “Reserve” or “Reserve Unit” command.
Command 22h done
The target returns this situation status when the target needs to interrupt the E/S process in the process because it received an important a message about the termination of the I / O process. This entry also indicates a conditional health issue.
The 28-hour queue (set of tasks) is full
Same as 08 Hours Busy.ACA
30 hours. active
40 hour task canceled
Links
[ftp://ftp.t10.org/t10/drafts/sam4/SAM-4] Paragraph 5.3.1
Wikimedia Foundation. 2010.
The SCSI status code is used to indicate very good performance or failure of the
What does the normal auto contingent allegiance bit do?
The auto-quota normal membership bit controls the rules for handling the automatic group condition invoked by the instruction. This bit is set to 0 to indicate which experts indicate that when a possible membership condition occurs, any instruction returns a test condition. This bit usually causes an interrupt at the initiator, allowing the device to respond with revived beginner status.
00h OK
< p >02h Control Status
If the target returns a control state in response to a command, it indicates that it has entered a loyalty state. This means that an error occurred while trying to execute the SCSI command. In this case, the initiator will typically issue a SCSI Request Sense command to obtain a keycode qualifier (
FIX: Indica Se Si è Verificata Una Condizione Di Appartenenza Condizionale.
NAPRAW: Wskazuje, że Wydaje Się, że Wystąpił Warunek Warunkowego Członkostwa.
FIX: Geeft Aan Dat Er Een Afhankelijke Lidmaatschapsvoorwaarde Is Opgetreden.
ИСПРАВЛЕНИЕ: Указывает на фактическое выполнение условия условного членства.
FIX: Indikerar Att Ett Villkorligt Medlemskap Har Inträffat.
FIX: Gibt An, Dass Eine Bedingte Mitgliedschaftsbedingung Aufgetreten Ist.
FIX: Indica Que Se Ha Producido Una Condición De Pertenencia Dependiente.
FIX: 조건부 멤버십 조건이 발생했다는 아이디어를 나타냅니다.
FIX : Indique Que Leur Condition D’adhésion Conditionnelle S’est Produite.
CORREÇÃO: Indica Que Ocorreu Uma Condição De Associação Condicional.
