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I now have the first of the high-speed discs (an SSD, or solid-state device) to swap in. That means teaparty has to go down again, so I can open up the case. This will likely happen this afternoon, though I can't yet say exactly when.
Teaparty will be down initially for about 30 minutes while I remove one of the existing Hard Disc Drives (HDDs) and insert the SSD. I'll then do some speed testing, probably with teaparty running. If this device is indeed faster (ie, it's the discs that are the problem, not some other aspect of the machine on the path to the discs) I will then have to take teaparty down for a further hour or so, while I shrink the existing filesystems by about 10% so they'll fit on the new SSD (the HDDs are 2TB, but annoyingly enterprise-grade SSDs are 1.92TB).
At that point teaparty will come back up, and run slow while the new SSD syncs up, and at some point next week we'll have to repeat this to replace the other HDD.
If the SSD is no faster, it means the bottleneck is elsewhere, and the second hour of downtime won't happen. There will instead be a brief second outage while I put the old disc back, then teaparty will run slow for another 24 hours while it resyncs the old second HDD.
Hopefully all this is clear. Call me on my mobile if this is going to be a disaster for anyone.
- Tom