[tech] molmol upgrades

[Gearoid (zixty) O'Donovan]

Hi all,

As some of you saw in #ucc, we ([I2N] and I) temporarily brought 
`molmol` down for RAM upgrades. These were successful and `molmol` is 
now fitted with 64GB of 1066MHz ECC DDR3 RAM.
We have also finally ordered the 4 new SSDs for `molmol`, 2x 4TB Micron 
MX500 and 2x 4TB Samsung 870 EVOs. The plan for these are a RAIDZ2 
(RAID6) setup totalling 16TB of space, doubling the current capacity of 
our zpool. The remaining HDDs (if staying mirrored, 5TB) could be used 
for less intensive read/writes, like webcams, mp3s, scratch, and some 
services.
We additionally learned that molmol has no remaining PCI-E slots, so 
finding a suitable Optane/NVMe drive for ZIL/SLOG/WAL will also involve 
either replacing one of the SAS HBAs and losing 8 drive slots on the 
front disk bays, or the fibre card (unless someone manages to find a PCI 
to M.2 adaptor lol). [NTU] has suggested the Synology E10M20-T1 
(https://www.mwave.com.au/product/synology-e10m20t1-m2-ssd-10gbe-combo-adapter-card-ac35810), 
a 10GbE + M.2 NVMe card to replace the fibre card, which could be then 
used as a spare or placed into one of the VM hosts.
We've been looking at a few other drives as well, such as the Kioxia PM5 
15TB SAS SSD 
(https://smicro.eu/kioxia-pm5-15tb-sas-12gb-s-2-5-15mm-bics3-etlc-1dwpd-sdfbe01gea01-1) 
and these rebranded Micron 5210 ION SATA SSDs 
(https://serverpartdeals.com/collections/solid-state-drives/products/lenovo-5210-ion-mtfddak3t8qde-3-84tb-sata-6gb-s-2-5-solid-state-drive). 
The first is probably a better case for an eventual replacement of 
molmol, or if we suddenly need a massive increase in capacity. The IONs 
could replace the EVOs in molmol, instead putting the EVOs into Ceph 
possibly? We also need to start looking for new Ceph drives, as many of 
our current drives are increasingly wearing out.

Feedback and recommendations on points made above are appreciated.

Kind regards,
zixty [GPO]
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