Ciao Angelo,
from a SpecV point of view I doubt we take any recovery action concerning unresponsive hosts.
I rather believe, by design we consider the host as offline and we (a SpecV system) need nothing do about it.
Not sure though if it would make a difference whether the host went offline gracefully and we received an SCN from the SAN switch or it went away silently - or simply does not respond because it hangs or similar.
Last not least, AFAIK we as SCSI target would not trigger recovery actions as port reset / bus reset etc.;
resetting our own fabric ports would impact any other ongoing I/O.
Just my thoughts on that...
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Christian Schroeder
IBM SpecV Storage Support with Passion
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Original Message:
Sent: Thu June 17, 2021 12:14 PM
From: Angelo Bernasconi
Subject: IBM Storage subsystem FC ports reset threshold
IHAC who made a question.Under certain circumstances when in the SAN: - misbehaving hosts, for example, become more common as hardware ages,
- bad host behavior usually caused by defective host bus adapter (HBA) hardware, bugs in the HBA firmware,
- problems with HBA drivers or Storage ports which produce the same symptoms (high latency) due to defective interface hardware or firmware issues,
In this situation some arrays deliberately reset their fabric ports if they are not receiving host responses within their specified timeout periods.Is there any reference which shows the threshold limits for different subsytems, like DS8K or SV family.Thanks
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