Re: [zfs-discuss] simulating directio on zfs?

2009-04-20 Thread Andrew Robb
I had to let this go and get on with testing DB2 on Solaris. I had to abandon zfs on local discs in x64 Solaris 10 5/08. The situation was that: * DB2 buffer pools occupied up to 90% of 32GB RAM on each host * DB2 cached the entire database in its buffer pools o having the file s

Re: [zfs-discuss] simulating directio on zfs?

2009-04-21 Thread Andrew Robb
Richard Elling wrote: Andrew Robb wrote: I had to let this go and get on with testing DB2 on Solaris. I had to abandon zfs on local discs in x64 Solaris 10 5/08. This version does not have the modern write throttle code, which should explain much of what you experience. The fix is available

Re: [zfs-discuss] simulating directio on zfs?

2009-04-21 Thread Andrew Robb
Richard Elling wrote: Andrew Robb wrote: Richard Elling wrote: Andrew Robb wrote: I had to let this go and get on with testing DB2 on Solaris. I had to abandon zfs on local discs in x64 Solaris 10 5/08. This version does not have the modern write throttle code, which should explain much of

[zfs-discuss] simulating directio on zfs?

2008-01-31 Thread Andrew Robb
The big problem that I have with non-directio is that buffering delays program execution. When reading/writing files that are many times larger than RAM without directio, it is very apparent that system response drops through the floor- it can take several minutes for an ssh login to prompt for