Monday, November 26, 2012

Linux multipath (device-mapper) optimizations with 3par storage

Earlier this year we bought a 6-node 3par v800 array and it was being deployed with Oracle RAC Clusters running OEL 6.x.

We discovered that 3par's default configuration for multipath.conf would yield a 30 second I/O stall whenever we failed one of the paths.

Eventually  we were able to get support to offer adding "dev_loss_tmo            1" to the multipath.conf as such:

 defaults {  
  user_friendly_names yes  
  polling_interval    5  
  dev_loss_tmo      1  
 }  

With that in place, we would only observe a 1 second I/O stall during a path failure.

2 comments:

  1. Our top-rated on-line roulette casinos provide a spread of table games to go well with|swimsuit} all stakes. You can select from a number of} deposit options and get access to customer support 24/7. European Roulette is usually the best roulette game to win cash at on-line casinos, as the home edge tends to be decrease. It’s as easy as visiting our recommended gambling websites and signing 카지노 사이트 추천 up.

    ReplyDelete
  2. In 2006, she spent a whole night time playing at Caesars Riverboat Casino, consuming robust alcoholic beverages offered for free. When she finally got here to the end of her cash enjoying in} blackjack, the casino offered her a counter examine, mainly a promissory notice, to enable her to maintain enjoying in}. By the end of the night time, she had racked up $125,000 in debt owed to the casino. After Kephart’s suit with|swimsuit} was dismissed, the casino’s unique suit 카지노사이트 with|swimsuit} was settled confidentially. With the arrival of legalized sports betting on Sept. 1, Kansans have a new new} method to gamble away their cash.

    ReplyDelete