thinking on how to do the replacements, when the new systems arrive we'll need to get them gradually in the cassandra cluster. Ideally starting with three machines (one per row). In {T123647} we got 18x additional SSDs and 6x have been already installed in 1007-1009 afaik.
That leaves us with 12x SSDs (not yet installed) to be used on the new hardware right away when it comes in, to have a full-spec'd 3x initial machines we'd need a total of 15x SSD, or in other words an additional 3x SSD from what we have available now.
So, I'm requesting 3x 1TB SSD of the same kind as {T123647}, these will be installed in the new hardware, when the old hardware is fully decomissioned there will be a surplus of 3x SSD that can be used as spares.