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Depending on interruptions on some storage systems, the complete channel can stall which looks like an outbound queue stall to Linux. When trying to acquire a free SBAL for a non-SCSI command, zfcp waits for 5 seconds for a free slot to appear. This is the right place to detect a queue stall: If the wait times out, we assume a stalled queue and try to recover this. The overall strategy should be to trigger the erp from specific events, and not try an overall escalation from one failed port to a full-blown queue recovery. If we manage to send a command, the status codes for this command or a timeout will trigger the right follow-on actions. Reviewed-by: Swen Schillig <swen@vnet.ibm.com> Signed-off-by: Christof Schmitt <christof.schmitt@de.ibm.com> Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com> |
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.. | ||
Makefile | ||
zfcp_aux.c | ||
zfcp_ccw.c | ||
zfcp_cfdc.c | ||
zfcp_dbf.c | ||
zfcp_dbf.h | ||
zfcp_def.h | ||
zfcp_erp.c | ||
zfcp_ext.h | ||
zfcp_fc.c | ||
zfcp_fsf.c | ||
zfcp_fsf.h | ||
zfcp_qdio.c | ||
zfcp_scsi.c | ||
zfcp_sysfs.c |