[ Thanks to dmandpenfold for this link.
“The problem hit the BATS exchange in Europe, but Chi-X traders
escaped the issue as that exchange’s systems have not yet not been
integrated – BATS only closed its takeover of the company last
week. BATS’ US market was also unaffected.
“Chi-X is likely to be migrated to the BATS platform in the next
year, and IT planning is currently underway. The platform runs on a
Linux-based datacentre and is hosted by Equinix – with
servers in Slough for European traders – though BATS said the host
was not at fault.”