Thursday, April 27, 2006
Monday, April 24, 2006
I did such a test today with 4 disks and sequential writing to different RAID levels using ZFS and 'dd' command.
- ZFS RAID ## write in MB/s
- RAID-10 (mirror+stripe) ## 117MB/s
- RAID-Z (RAID-5) ## 175MB/s
- RAID-0 (striping) ## 233MB/s
In theory ZFS in this test (writing) should give us the performance of two disks in case of RAID-10, the performance of 3 disks in case of RAID-Z and the performance of 4 disks in case of RAID-0. And that's exactly what we see above! (117/2 = 58.5000 ; 175/3 = 58.3333 ; 233/4 =58.2500).
Saturday, April 22, 2006
SANTA CLARA, Calif., April 21 /PRNewswire-FirstCall/ -- Sun Microsystems, Inc. (Nasdaq: SUNW - News) today announced new benchmark results involving the performance of the open source MySQL database running online transaction processing (OLTP) workload on 8-way Sun Fire(TM) V40z servers. The testing, which measured the performance of both read/write and read-only operations, showed that MySQL 5.0.18 running on the Solaris(TM) 10 Operating System (OS) executed the same functions up to 64 percent faster in read/write mode and up to 91 percent faster in read-only mode than when it ran on the Red Hat Enterprise Linux 4 Advanced Server Edition OS.
"MySQL and Sun have worked to optimize the performance of MySQL Network software certified for the Solaris 10 OS," said Zack Urlocker, vice president of marketing for MySQL AB. "This benchmark demonstrates Sun's continued leadership in delivering a world-class operating environment that provides excellent MySQL performance for our mutual enterprise customers."I wonder if it means there were some changes to MySQL so it runs faster on Solaris?
In our internal tests MySQL on Linux (however older MySQL versions) was actually slightly faster than on Solaris - maybe we should re-check it. Unfortunately not much info on actual system tuning and disk config is reported (was ZFS used? how much IOs were generated, etc.).
Actual benchmark is here and official Sun announcement here.
Friday, April 21, 2006
As T1000 uses only two memory controllers out of 4 in US-T1 it could be slower than T2000 with the same CPU - I guess it could depend on application - we'll see how it's here.
Wednesday, April 19, 2006
Apr 18 17:45:30 server SUNW,UltraSPARC-II: [ID 197328 kern.info] [AFT0] Corrected Memory Error detected by CPU8, errID 0x0002de3b.e98a88fa
Apr 18 17:45:30 server AFSR 0x00000000.00100000
Apr 18 17:45:30 server AFSR.PSYND 0x0000(Score 05) AFSR.ETS 0x00 Fault_PC 0x11e7fe8
Apr 18 17:45:30 server UDBL Syndrome 0x64 Memory Module Board 0 J3300
Apr 18 17:45:30 server SUNW,UltraSPARC-II: [ID 429688 kern.info] [AFT0] errID 0x0002de3b.e98a88fa Corrected Memory Error on Board 0 J3300 is Intermittent
Apr 18 17:45:30 server SUNW,UltraSPARC-II: [ID 671797 kern.info] [AFT0] errID 0x0002de3b.e98a88fa ECC Data Bit 7 was in error and corrected
As these errors happened few more times system finally removed single page (8kB) from a system memory so problem will not escalate and won't possibly kill system or application. Well, I can live with 8kB less memory - that's real Predictive Self Healing.
Apr 18 19:14:51 server SUNW,UltraSPARC-II: [ID 566906 kern.warning] WARNING: [AFT0] Most recent 3 soft errors from Memory Module Board 0 J3300 exceed threshold (N=2, T=24h:00m) triggering page retire
Apr 18 19:14:51 server unix: [ID 618185 kern.notice] NOTICE: Scheduling removal of page 0x00000000.c709c000
Apr 18 19:15:50 server unix: [ID 693633 kern.notice] NOTICE: Page 0x00000000.c709c000 removed from service
Tuesday, April 18, 2006
Monday, April 10, 2006
"If you are interested in downloading the SolarisTM Containers for Linux Applications functionality, BrandZ DVD 35 for the SolarisTM Operating System (Solaris OS) for x86 platforms is available now as a free download from the Sun Download Center. Based on SolarisTM Express build 35, this download is a full install of Solaris OS and includes all of the modifications added by the BrandZ project.
BrandZ is a framework that extends the SolarisTM Zones infrastructure to create Branded Zones, which are zones that contain non-native operating environments. Each operating environment is provided by a brand that may be as simple as an environment with the standard Solaris utilities replaced by their GNU equivalents, or as complex as a complete Linux user space. The brand plugs into the BrandZ framework.
The combination of BrandZ and the lx brand, which enables Linux binary applications to run unmodified on Solaris OS, is Solaris Containers for Linux Applications. The lx brand is not a Linux distribution and does not contain any Linux software. The lx brand enables user-level Linux software to run on a machine with a Solaris kernel, and includes the tools necessary to install a CentOS or Red Hat Enterprise Linux distribution inside a zone on a Solaris system.
The lx brand will run on x86/x64 systems booted with either a 32-bit or 64-bit kernel. Regardless of the underlying kernel, only 32-bit Linux applications are able to run.As part of the OpenSolaris community, BrandZ is a hosted project on this open source web site that contains detailed information on BrandZ and the latest information on build 35."
ps. yes, this is continuation of the famous Janus project (LAE)
Tuesday, April 04, 2006
More info here.