Hi,

As I understand, below 3 timeouts contribute to the total time taken for
marking an iSCSI connection unavailable for IOs.

noop_out_interval
noop_out_timeout
replacement_timeout

/* timeouts in seconds */
#define DEF_LOGIN_TIMEO         15
#define DEF_LOGOUT_TIMEO        15
#define DEF_NOOP_OUT_INTERVAL   10
#define DEF_NOOP_OUT_TIMEO      15
#define DEF_REPLACEMENT_TIMEO   120

Can someone please explain why default values are higher? Do we really need
to have these higher default values? Are these default values reduced from
earlier open-iscsi versions to newer versions? If not, should these values
get reduced significantly for the fact that newer network devices are
faster?

Will higher values not cause the more time for IOs to failover to other
available paths? What are the options for faster failover?


Thanks,
Nitish

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