>>The Company ID, VSI, and VSIE are generated by LIO based upon the >> current vpd_unit_serial configfs attribute value. >> >> So as long as vpd_unit_serial is persistent, and the same value for >> backend devices across export failover to different nodes, Xen will >> always see the same EVPD information. >> >> Are you saying that vpd_unit_serial is already persistent across export >> failover, but Xen is still having problems..? >> >> Have you confirmed with sg_inq -i both before and after the export >> failover occurs..? >> Oh... That is interesting! I wish I knew this earlier as perhaps the issue we've encountered has been with us not setting the vpd_unit_serial /correctly/ at times and then only noticing that the SCSIID had changed and thus ended up looking down the wrong(?) track. Other than in the source, is there somewhere this is documented that I should have found? > >Btw, here is the code where EVPD=0x83 DEVICE IDENTIFIER is generated >from a backend's vpd_unit_serial, (note 00 14 05 Company ID prefix) > >https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/tree/drivers/target/target_core_spc.c#n188 Thanks for the link (and your time), I'm not developer (especially with c) but it's useful to see where this is implemented. I'm going to go through our setup and ensure the vpd_unit_serial is indeed being correctly enforced at preset, then test failover several times. Again, thank you for your assistance, I'll report back later in the week. ��.n��������+%������w��{.n����j� ����{ay� ʇڙ���f���h������_�(�階�ݢj"��������G����?���&��
