Bob Friesenhahn wrote: > On Sat, 17 May 2008, James C. McPherson wrote: > >> Bob Friesenhahn wrote: >>> On Fri, 16 May 2008, James C. McPherson wrote: >>>>> 3) I've read that it's best practice to create the RAID set utilizing >>>>> Hardware RAID utilities vice using ZFS raidz. Any wisdom on this? >>>> You've got a whacking great cache in the ST2540, so you might as >>>> well make use of it. >> >> Hi Bob, >> You've made an assumption about what I wrote. That assumption >> is incorrect. Kenny, in addition, did not say that he was or > > My assumption based on your "You've got a whacking great cache in the > ST2540, so you might as well make use of it." was that it was intended > to imply that if the Hardware RAID utilities were not used that the > 2540's NV write-cache would not be available/useful.
Indeed. And there is absolutely no justification for that assumption. I had hoped that the following sentence suggesting a perusal of the Best Practices would have made it clear that it is indeed possible (I would say, recommended) to maximise the usage of a cache and ZFS' specific design features. >> I am also quite well aware of the design and behaviour of the >> raid engine in the ST2530. > > Since there seems to be no specification of the internal architecture of > the 2530 and 2540 (quite odd for a Sun product!), perhaps you can create > a whitepaper which describes this architecture so that Sun customers can > better understand how to use the product. I'm not the person to do that, but I will forward your suggestion on to somebody who is better placed to do so. James C. McPherson -- Senior Kernel Software Engineer, Solaris Sun Microsystems http://blogs.sun.com/jmcp http://www.jmcp.homeunix.com/blog _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
