H755 Raid Controller

[Ailene Goldhirsh]

Itis replacing a 11-12 year old machine and I was planning on installing VMs (probably just KVM on Ubuntu 22.04) and then possibly running a lightweight kubernetes distro (probably k3s) in a few of them, leaving some capacity for other VM-based requirements.

Then do note that if you are using more than 2 Windows Server VMs, you may want to keep the number of CPU cores of the ESXi to a max of 16 cores, else in your case, each Windows Server license (can run 2 VMs) would cost you 2x $1600 (16 cores cost approx $1600) as the server licenses are based on the hosts number of cores (regardless how many vCPUs you assign to the Windows Server VM).

BTRFS can be considered as Linux file system like EXT4 or NTFS. Only certain hardware like Synology NAS where BTRFS (with RAID support) can be used to replace RAID since it is literally a proprietary RAID solution that replaces RAID 5 or RAID 6.

As little as I understood your position, you should take the opportunity to learn the basics of (common standard) RAID. Several major NAS manufacturers and a smaller one with significant market share among SME are based in Taiwan and have published how-tos, tutorials and guides intended for SME administrators and hence easier to understand. They are also addressing mainland China market, often with localized versions and with presence in mainland China too.

Since all your drives are behind a hardware PERC RAID H755 controller, there is no BTRFS or ZFS option available for you until replacing the RAID controller with an HBA. RAID5 for SSDs is totally fine and kinda standard nowadays, so go for it -parity-raid-vs-ssd .

The main issues with RAID5 for SSD is write amplification, you are writing parity on all drives so for 5 SSDs 1 block is 5 writes, one to each of them. This also means that they will wear at the same rate and need replacing at the same time, that might not be a complete issue for you but depending on how much data you get back from your SSDs you might not get much warning for replacement. UREs on SSD is not an issue, HDD Raid 5 is the frowned upon setup.

I cannot comment on rebuild times for dell PERC cards, this is not something to totally discount. Whilst an SSD can perform well with simultaneous multiple read/write I have no idea how good those dell PERC cards are at resilvering onto SSDs whilst full I/O is expected at the same time. If you care about this then RAID10 might be worth a look (and adding an extra drive).

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