Re: [Linux-HA] very odd iowait problem

2010-07-05 Thread Bill Davidsen
Miles Fidelman wrote: > Hi Folks, > > I'm experiencing a very odd, daily, high-load situation - that seems > to localize in my disk stack. I direct this to the xen-users, > linux-raid and linux-ha lists as I expect there's a pretty high degree > of experience on these lists with complicated dis

Re: [Linux-HA] very odd iowait problem

2010-06-23 Thread Ciro Iriarte
2010/6/19 Miles Fidelman : > > - beyond the complexity and load, can you say a little more about why "RAID6 > on software is not a good idea, even worse with that hardware." > First you have the load issue, just one processor (at most two threads with HT) is used for the real work and RAID mainten

Re: [Linux-HA] very odd iowait problem

2010-06-21 Thread Dimitri Maziuk
On Saturday 19 June 2010 12:40, Miles Fidelman wrote: > The last comes to mind as a result of learning, the hard way, that a > failing disk can manifest by slowing a server to a crawl, as the drivers > keep retrying operations until they succeed, rather than declaring an > error and dropping a dri

Re: [Linux-HA] very odd iowait problem

2010-06-19 Thread Miles Fidelman
Ciro Iriarte wrote: > 2010/6/19 Miles Fidelman: > >> Hi Folks, >> >> I'm experiencing a very odd, daily, high-load situation - that seems to >> localize in my disk stack. I direct this to the xen-users, linux-raid >> and linux-ha lists as I expect there's a pretty high degree of >> experience

Re: [Linux-HA] very odd iowait problem

2010-06-19 Thread Ciro Iriarte
2010/6/19 Miles Fidelman : > Hi Folks, > > I'm experiencing a very odd, daily, high-load situation - that seems to > localize in my disk stack.  I direct this to the xen-users, linux-raid > and linux-ha lists as I expect there's a pretty high degree of > experience on these lists with complicated d

[Linux-HA] very odd iowait problem

2010-06-19 Thread Miles Fidelman
Hi Folks, I'm experiencing a very odd, daily, high-load situation - that seems to localize in my disk stack. I direct this to the xen-users, linux-raid and linux-ha lists as I expect there's a pretty high degree of experience on these lists with complicated disk driver stacks. I recently virt