I setup VIO servers so rarely, that it’s really easy to miss a step. These are some of the tuning commands I use when setting up VIO. Set these on the VIO server.

Set the FC adapter error recovery policy to fast_fail:

chdev -dev fscsi0 -attr fc_err_recov=fast_fail -perm

Enable dynamic tracking on the FC adapter:

chdev -dev fscsi0 -attr dyntrk=yes -perm

Set the FC adapter link type to point-to-point:

chdev -dev fcs0 -attr init_link=pt2pt -perm

I haven’t found a need to tweak the num_cmd_elems, lg_term_dma, or max_xfer_size with 4Gb Fibre Channel.
For each disk to be used as a VTD, disable SCSI reservations:

chdev -dev hdisk1 -attr reserve_policy=no_reserve -perm

After these are run, reboot the VIO server. And then check these on the client LPARs.

Set the VSCSI error recovery mode to fast_fail for each VSCSI adapter:

chdev -l vscsi0 -a vscsi_err_recov=fast_fail

Set the VSCSI path timeout for each VSCSI adapter:

chdev -l vscsi0 -a vscsi_path_to=30

Set the healthcheck mode and interval:

chdev -l hdisk0 -a hcheck_mode=nonactive -a hcheck_interval=20

I setup VIO servers so rarely, that it’s really easy to miss a step. These are some of the tuning commands I use when setting up VIO. Set these on the VIO server.<\/p>\n

Set the FC adapter error recovery policy to fast_fail:
\n<\/p>\n

chdev -dev fscsi0<\/b> -attr fc_err_recov=fast_fail -perm<\/pre>\n
<\/code>
\nEnable dynamic tracking on the FC adapter:
\n<\/p>\n
chdev -dev fscsi0<\/b> -attr dyntrk=yes -perm<\/pre>\n
<\/code>
\nSet the FC adapter link type to point-to-point:
\n<\/p>\n
chdev -dev fcs0<\/b> -attr init_link=pt2pt -perm<\/pre>\n
<\/code>
\nI haven’t found a need to tweak the num_cmd_elems, lg_term_dma, or max_xfer_size with 4Gb Fibre Channel.
\nFor each disk to be used as a VTD, disable SCSI reservations:
\n<\/p>\n
chdev -dev hdisk1<\/b> -attr reserve_policy=no_reserve -perm<\/pre>\n
<\/code><\/p>\n
After these are run, reboot the VIO server. And then check these on the client LPARs.<\/p>\n
Set the VSCSI error recovery mode to fast_fail for each VSCSI adapter:
\n<\/p>\n
chdev -l vscsi0<\/b> -a vscsi_err_recov=fast_fail<\/pre>\n
<\/code>
\nSet the VSCSI path timeout for each VSCSI adapter:
\n<\/p>\n
chdev -l vscsi0<\/b> -a vscsi_path_to=30<\/pre>\n
<\/code>
\nSet the healthcheck mode and interval:
\n<\/p>\n
chdev -l hdisk0 -a hcheck_mode=nonactive -a hcheck_interval=20<\/pre>\n
<\/code><\/p>\n","protected":false},"excerpt":{"rendered":null,"protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[2,1],"tags":[],"class_list":["post-637","post","type-post","status-publish","format-standard","hentry","category-aix-notes","category-uncategorized"],"_links":{"self":[{"href":"https:\/\/rootuser.ninja\/index.php\/wp-json\/wp\/v2\/posts\/637","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/rootuser.ninja\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/rootuser.ninja\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/rootuser.ninja\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/rootuser.ninja\/index.php\/wp-json\/wp\/v2\/comments?post=637"}],"version-history":[{"count":0,"href":"https:\/\/rootuser.ninja\/index.php\/wp-json\/wp\/v2\/posts\/637\/revisions"}],"wp:attachment":[{"href":"https:\/\/rootuser.ninja\/index.php\/wp-json\/wp\/v2\/media?parent=637"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/rootuser.ninja\/index.php\/wp-json\/wp\/v2\/categories?post=637"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/rootuser.ninja\/index.php\/wp-json\/wp\/v2\/tags?post=637"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}