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Status Not under consideration
Workspace AIX
Created by Guest
Created on Jul 14, 2019

FSCSI driver changed delayed 15 sec

I understand your last update as good news - there is no big difference between AIX 6.1 with sddpcm and AIX 7.1 with sddpcm. Of course we don't support AIX 6.1 anymore and for AIX version please use AIX 7.1 or AIX 7.1 with latest TL and latest or latest -1 SP. These days aix mpio is a preferred multipathing sw over sddpcm. I guess you're aware of all this info.

Regarding Customer's question there will be no news, a delay of 15 sec. in hard coded in AIX and this is done with a reason. Now you or Cust. focus just to one particular test while in reality many different things can happen. For example, we may get a Fabric format RSCNs telling us that storage ports have gone. But in case of Cisco switch it really means the zone change (means all targets are still on SAN, no one dropped of the SAN so no need to wait 15 sec.) while some other switch uses it for the opposite scenario where targets actually did drop off the SAN. So we can expect different scenarios for the same command received from different switch vendors. Also we can't know if the storage port really failed permanently, or it gone for a few sec. due a zone change or due switch reboot. Reacting fast on each minor issue is really not a design we want to follow here.

In case customer doesn't like it, he can apply a RFE (request for enhancement):

Idea priority Medium
  • Guest
    Jul 31, 2019

    For the 8GB fibre channel adapters, there will be a 15 second delay when the connection to the port is lost. For the 16 and 32 GB adapters, AIX does begin polling immediately when detecting the port is lost and 15 seconds is the maximum delay. The delay can be shorter for 16 and 32 GB adapters if the port comes online in less than 15 seconds. There are no plans in AIX to change these existing design points.