I’ve recently had the opportunity to talk with a small sample of SLES 11 and RH 6 Linux users, all developing their own applications. All were long-time Linux users, and two of them, one in travel services and one in financial services, had applications that can be described as both large and mission-critical.
The overall message is encouraging for Linux advocates, both the calm rational type as well as those who approach it with near-religious fervor. The latest releases from SUSE and Red Hat, both based on the 2.6.32 Linux kernel, show significant improvements in scalability and modest improvements in iso-configuration performance. One user reported that an application that previously had maxed out at 24 cores with SLES 10 was now nearing production certification with 48 cores under SLES 11. Performance scalability was reported as “not linear, but worth doing the upgrade.”
Overall memory scalability under Linux is still a question mark, since the widely available x86 platforms do not exceed 3 TB of memory, but initial reports from a user familiar with HP’s DL 980 verify that the new Linux Kernel can reliably manage at least 2TB of RAM under heavy load.
File system options continue to expand as well. The older Linux FS standard, ETX4, which can scale to “only” 16 TB, has been joined by additional options such as XFS (contributed by SGI), which has been implemented in several installations with file systems in excess of 100 TB, relieving a limitation that may have been more psychological than practical for most users.
The reports show that Windows 7 penetrated the consciousness of the market by the end of 2009, with a strong majority of US consumers aware of the product. We also found that consumers who adopted Windows 7 in Q4 were generally very satisfied with their Windows 7 PCs.
Perhaps the most interesting finding of the reports involves upgrade behaviors. Historically, most consumers have not upgraded their PCs with new OSes -- though Mac users and some technophile consumers have been an exception on this count. Instead, the majority of consumers have acquired new OSes when they purchase their new PC. These are known as "replacement cycle upgrades."
With Windows 7, however, upgrade behavior was much stronger. Why? In short, Windows 7 is a thinner client program than was Windows Vista, meaning that it works well on older hardware configurations. In the past, OSes were designed with Moore's Law as an underlying assumption -- that is, that newer PC hardware would be significantly faster and more powerful than the previous generation's hardware. Windows 7, however, is a less burdensome OS than Windows Vista. The rise of Netbooks, the physical assets of multi-PC households, and an attachment by many consumers to their Windows XP machines all contributed to the need for a sleeker, thinner Windows OS, which Windows 7 delivered.
Among early adopters of Windows 7, in Q4, for the first time upgrading behavior matched replacement cycle purchasing, as this Figure shows: