Depends on the vintage. Up to about 2015 a 128 GB workstation config typically had a <= 512 GB boot SSD and some spinning disk as well.
In servers it's actually quite nice in homelab style setups where you might want to preserve your working session states, or just doing it on a nightly schedule without worrying about losing work.
For VMs it's of course useful to persist vm state to disk and suspend for lots of reasons (don't keep the RAM reseved, or free up VFIO passhthrough hardware for instance). But people often use hypervisor based snapshot for this. One advantage guest OS supported hibernation has it that your guest is aware of its own power state changes and can run your configured power management event hooks on suspend and wake. In the VFIO reddit it seems to be common for people who do windows vm gaming with gpu passthrough to prefer guest hibernate to hyprevisor side snapshots as well, not sure what are the main advantage there.
> In servers it's actually quite nice in homelab style setups where you might want to preserve your working session states, or just doing it on a nightly schedule without worrying about losing work.
At this point it's a server in the name only. Even Supermicro takes ages to boot up, HPE and DELL can take up to 5-10 minutes to boot depending on the config.
Sure, there are some situations where it can be used for server, but hibernate is a middle ground between a full boot and STR and loses on the most important metric - the actual boot time.
> For VMs it's of course useful to persist vm state to disk and suspend for lots of reasons
But again it's quite niche. You trade the RAM for the disk space and if you are short on RAM then something gone wrong with planning the resources in the first place. Sure, in some situations (homelab again, *sigh*) it can be useful, but again it's not the popular option. With VDI you still get the bootstorm and lose the caching of the golden image.
> Depends on the vintage. Up to about 2015 a 128 GB workstation config typically had a <= 512 GB boot SSD and some spinning disk as well.
And again this is not 2015 anymore and surely you can have a $50 M.2 (or even SATA) 1Tb QLC SSD for the system drive (and your fancy whatever Tbs SSD for the actual workload).
> not sure what are the main advantage there.
The main difference is what the hardware is initialized again (instead of relying on the hypervisor to restore everything) so I bet it's some GPU shenanigas.
I would like to clarify: sure, in some cases hibernating works^W is useful, but my initial point was about 'unbalanced' configurations and having 128Gb RAM with a boot drive < 512Gb AND requiring hibernate is what would constitute as unbalanced for me.
PS for the sake of it, checked my notebook:
TM420 C:\Users\amc>dir c:\hiberfil.sys /ahs
Volume in drive C is Windows
Volume Serial Number is DEAD-BEEF
Directory of c:\
07.05.2023 03:03 4,901,584,896 hiberfil.sys
1 File(s) 4,901,584,896 bytes
0 Dir(s) 62,332,203,008 bytes free
Even if it was a full file for 12Gbs of RAM (damn those soldered modules) I would be fine with my 256Gb SSD.
Hibernation on a server? Pointless most of the time, because the bulk of the startup time is pre-OS. And hibernating VMs is just retarded.