Hosting: August 2005 Archives

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ftp.heanet.ie now comprises over 12 Terabytes of storage, 32 Gigabytes of RAM and a new 136 Gigabyte RAID-0 caching layer for popular content. We hope that this level of storage will unperin an effective service, meeting current and future requirements. ftp.heanet.ie's network connectivity has also been significantly upgraded and there are changes which may of interest; ftp.heanet.ie serves content over FTP, HTTP and RSYNC and is available over IPv4 and IPv6. Clients should correctly resolve the IP version supported; however, the ftp.ipv4.heanet.ie and ftp.ipv6.heanet.ie records facilitate manual specification of the IP version to be used. For some time now ftp.heanet.ie has tagged all outgoing traffic with a differential services code-point (DSCP) IP header value of 0x08 which is the conventional value assigned to "Less than Best Effort" (LBE). This means that even with a minimal IP Quality of Service (QoS) configuration on your network it is possible to de-prioritise traffic from ftp.heanet.ie. This also enables HEAnet and GÉANT to ensure that ftp.heanet.ie traffic does not contend with customer traffic. ftp.heanet.ie now supports Jumboframes of up to 9000 bytes in size Traditionally ethernet and general internal traffic is restricted to sending frames of 1500 bytes in size. A file 1 Megabyte in size took about 750 sent packets to download. With Jumboframes, this can now be achieved in fewer than 120 packets. This can represent a major speed increase, and we've been able to download entire DVD ISO's in 9 seconds in testing with jumboframes enabled. HEAnet currently extends jumboframe connectivity to the GEANT network. ftp.heanet.ie now sports 4 Gigabit/sec of load-balanced out-bound connectivity, and 2 Gigabit/sec of resilient in-bound connectivity. This connectivity is in place in order to cope with future peak demands and is not intended for immediate use, so rate-limits at 1.5 Gigabit/sec are currently in-place. Further to this, we are committed to ensuring no contention with other general internet or customer traffic through the use of QoS configurations. We have also taken the opportunity of the migration to revise and renew the content of the mirror. Over three years of usage, some files have become corrupted due to local and remote problems. We rely on user reports of such errors and always try to rectify them as quickly on possible, however now we are in a position to do more; We have re-synced from scratch many of our popular items. For example, we have re-synced the entire RedHat tree (some 256Gb of content) and manually verified its contents. We have also checked some 50,000 Debian packages and re-synced approximately 100 from our Debian archive. We now have the CPU and spare I/O capacity to start automated checksum verification for as much of our content as we are in a position to verify, and are putting this system in place.