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Sizing for Virtual Private Server (VPS) & SSDs

Hardware requirements for VPS is pretty interesting; in the sense of a problem to be solved. CPU performance has improved significantly year after year, to the extend that 10 x 5-year old servers, which used to cost $5000 each, can be converted to 10 VPS, and placed into 1 physical server, which cost $5000, and can perform well... if CPU is all that matters.

Unfortunately, the 5-year old server with a U160 10K SCSI, compared to the new server with 15K SCSI is not very far off in disk IOPs performance.

Disk IOPs is the bottleneck in many servers, rather than CPUs. In sizing a server for hosting multiple VPS, we need to put in as much RAM as possible, to allow the OS to use the RAM for cache, and avoid reads where possible.

Next, choose storage with high random RW IOPs. eg. RAID 10, 15K drives. And possibly SSDs if the performance justifies the price. Intel quotes very high 4KB IOPs for the X25-E and X25-M. Very tempting. Unfortunately, the details of tests done are not available with the spec sheets. Stating "8GB span" and "up to" in the spec sheet is not all that reassuing. Performance is also known to vary significantly during benchmarking tests, depending on how much of the SSDs is used, and length of test runs.

I have several pieces of the X25-M and X25-E, and will be testing the SSDs. If they produce at least 3 times more IOPs, sustained, compared to 15K drives, they are going into our next generation of VPS servers.

Mar 2010

[Sysadmin] Access to servers via mobile device and ssh
[Sysadmin] RAID 0 scaling on SCSI U320, Bonnie++ 1.93c benchmark results
[Sysadmin] TODO (Apr 2007)
[Sysadmin] Recover from mistakes in /etc/fstab or e2label usage
[Sysadmin] Server overloaded?
[Sysadmin] Server load high: CPU bound
[Sysadmin] Smokeping: deluxe latency measurement tool
[Sysadmin] Smokeping
[Sysadmin] Jul 08 to Oct 08 updates
[Sysadmin] Weak link - downtimes caused by the organic being
[Sysadmin] BIOS upgrades - uniflash - hotflash
[Sysadmin] Sizing for Virtual Private Server (VPS) & SSDs
[Sysadmin] iphone, ipod - bluetooth keyboard - Nokia e51
[Sysadmin] e2label, fdisk, /etc/fstab, mount, linux rescue, rescue disk, CentOS
[Sysadmin] opensuse, fix waiting for mandatory device, eth0, eth1, eth2, eth3
[Sysadmin] mount: could not find filesystem '/dev/root'
[Sysadmin] Parallels Virtuozzo Physical server to Container migration (vzp2v)
[Web hosting] DDOS (Distributed Denial of Service)
[Web hosting] Uptime for dedicated server, VPS and shared server
[Web hosting] Shared, Guaranteed and Dedicated Bandwidth
[Web hosting] Unmetered bandwidth
[Web hosting] Free domains?
[Web hosting] Joomla Scalability
[SPAM handling] Tracking applications which are exploited for mass spam mailing
[Buzzwords] Clusters, Clustering
[Security] Destruction of faulty hard disks
[Storage] Benchmark using iometer on linux
[SSD] Benchmark Intel X25-E and Intel X25-M flash SSDs
[SSD] Intel X25-E 64GB G1, 4KB Random IOPS, iometer benchmark
[SSD] Intel X25-M 160GB G2, 4KB Random IOPS, iometer benchmark
[SSD] Comparison of Intel X25-E G1 vs Intel X25-M G2
[cPanel] ClamAV version has reached End of Life! Please upgrade to version 0.95
[cPanel] How to install Java, ImageMagick and ffmpeg
[Perl] Opening text files for reading, and simple regexp (regular expressions)