This info is generally applicable to AIX systems using FAStT storage and is thought to improve performance. Some of these may be outdated, investigate before using.
{"id":1033,"date":"2009-06-18T14:08:08","date_gmt":"2009-06-18T18:08:08","guid":{"rendered":"http:\/\/patrickv.info\/wordpress\/?p=70"},"modified":"2009-06-18T14:08:08","modified_gmt":"2009-06-18T18:08:08","slug":"performance-improvement-for-fastt","status":"publish","type":"post","link":"https:\/\/rootuser.ninja\/index.php\/2009\/06\/18\/performance-improvement-for-fastt\/","title":{"rendered":"Performance improvement for FASTt"},"content":{"rendered":"This info is generally applicable to AIX systems using FAStT storage and is thought to improve performance. Some of these may be outdated, investigate before using.
\n<\/p>\n
FC adapter attribute changes:<\/p>\n
lg_term_dma from 0x200000 to 0x1000000 – (from 2 MB to 16 MB)<\/p>\n
lsattr -El fcs0\nchdev -l fcs0 -a lg_term_dma=0x1000000 -P\ncfgmgr\nlsattr -El fcs0<\/code><\/pre>\nnum_cmd_elems from 200 to 1024<\/p>\n
lattr -El fcs0\nchdev -l fcs0 -a num_cmd_elems=1024 -P\ncfgmgr\nlsattr -El fcs0<\/code><\/pre>\nDAR attribute changes:<\/p>\n
load_balancing – IBM recommends against using load balancing in the DAR driver. Use with caution:<\/p>\n
lsattr -El dar0\nchdev -l dar0 -a load_balancing=yes\nlsattr -El dar0<\/code><\/pre>\nSetting autorecovery<\/p>\n
lsattr -El dar0\nchdev -l dar0 -a autorecovery=yes\nlsattr -El dar0<\/code><\/pre>\nhdisk attribute changes: [VG must be varied-off]<\/p>\n
queue_depth from the default to 16<\/p>\n
lsattr -El hdisk\nchdev -l hdiskX queue_depth=16\nlsattr -El hdisk<\/code><\/pre>\nprefetch_mult from 0 to 8<\/p>\n
lsattr -El hdisk\nchdev -l hdiskXX prefetch_mult=8\nlsattr -El hdisk<\/code><\/pre>","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":[2,7,1],"tags":[],"class_list":["post-1033","post","type-post","status-publish","format-standard","hentry","category-aix-notes","category-san-notes","category-uncategorized"],"_links":{"self":[{"href":"https:\/\/rootuser.ninja\/index.php\/wp-json\/wp\/v2\/posts\/1033","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=1033"}],"version-history":[{"count":0,"href":"https:\/\/rootuser.ninja\/index.php\/wp-json\/wp\/v2\/posts\/1033\/revisions"}],"wp:attachment":[{"href":"https:\/\/rootuser.ninja\/index.php\/wp-json\/wp\/v2\/media?parent=1033"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/rootuser.ninja\/index.php\/wp-json\/wp\/v2\/categories?post=1033"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/rootuser.ninja\/index.php\/wp-json\/wp\/v2\/tags?post=1033"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}