Look for that to change. Red Hat told us a year ago that Xen was dead and being phased out. If Oracle wishes to continue to use RHEL code with tweaks they will be moving to KVM. I doubt they want to go through the bother of messing with Xen if it's removed in RHEL.
Oracle has had their own independent Xen implementation that they ship as Oracle VM. And Sun's Xen uses Solaris as the dom0. No Red Hat Xen.
Be careful about the distinction between SPARC and x86 systems -- while the generic Solaris OS is the same on both, drivers and hardware support differ. The Ultra 5 and 10 systems sold by Sun are SPARC based and support IDE DMA.
Is the installation guide you mention online at docs.sun.com?
Likewise, does Solaris x86 support any form of DMA IDE? I didn't think it did, and the advice always seems to be to use SCSI with Solaris.
Solaris 7 on x86 did not support DMA for IDE and I don't think this changed for Solaris 8. (Solaris SPARC does use DMA, if you're using IDE on the cheaper workstations.)
IDE block mode I/O is not enabled by default, so one disk sector is transferred per interrupt -- see ata(7D) and check your ata.conf file to change this.
Filesystem metadata writes are also synchronous by default, which is good for filesystem consistency, but bad for performance. UFS metadata logging is disabled by default, which is bad for consistency, but good for performance.
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Look for that to change. Red Hat told us a year ago that Xen was dead and being phased out. If Oracle wishes to continue to use RHEL code with tweaks they will be moving to KVM. I doubt they want to go through the bother of messing with Xen if it's removed in RHEL.
Oracle has had their own independent Xen implementation that they ship as Oracle VM.
And Sun's Xen uses Solaris as the dom0.
No Red Hat Xen.
Is the installation guide you mention online at docs.sun.com?
Solaris 7 on x86 did not support DMA for IDE and I don't think this changed for Solaris 8. (Solaris SPARC does use DMA, if you're using IDE on the cheaper workstations.)
IDE block mode I/O is not enabled by default, so one disk sector is transferred per interrupt -- see ata(7D) and check your ata.conf file to change this.
Filesystem metadata writes are also synchronous by default, which is good for filesystem consistency, but bad for performance. UFS metadata logging is disabled by default, which is bad for consistency, but good for performance.