[pmg-devel] [PATCH docs] Update minimal and recommended system requirements

[Thomas Lamprecht]

On 3/12/19 4:09 PM, Alwin Antreich wrote:
> On Tue, Mar 12, 2019 at 09:41:36AM +0100, Thomas Lamprecht wrote:
>> On 3/7/19 3:23 PM, Alwin Antreich wrote:
[snip]
>>>  
>>> -* Hardware RAID1 or RAID10, Raid Controllers need write cache with
>>> -  batteries backup module for best performance
>>> +* 1 Gbps ethernet network interface card
>>>  
>>> -* Enterprise class SSD with power loss protection (e.g. Intel SSD DC
>>> -  35xx/36xx/37xx)
>>> +* Storage: at least 8 GB free disk space, best with RAID1 or RAID10, +
>>> +  use hardware RAID controller with battery backed write cache (``BBU'') or
>>> +  non-RAID with ZFS and SSD cache (optional). ZFS is not compatible with a
>>
>> non-RAID sounds strange if you then can select only modes starting with "RAID..."
>> in the installer for  ZFS. Also are we sure that we want to say "best with HW
>> raid" as I have the slight experience that HW raids often are not really "the best"
>> Maybe, "best with redundancy" then shortly mention the possibilities (ZFS, HW RAID)?
>>
> The wording 'non-RAID' is used to identify disks not in RAID modes.

But you explicitly write "ZFS is not compatible with a hardware RAID controller"
so this should be clear already.

Also, that's what you mean and is technically correct, but not what a (new) user may
know, especially if then "zfs (RAID01)", "zfs (RAID1)", ... is written in the
installer, you see the confusion possibility?

IMO, this should be short and clear, so what do you want to tell the user, I'd
guess that redundancy is "recommended", so writing that should be correct, examples
about what technology to use to achieve that can be then given shortly, but the
point you want to convey is "redundancy" not the use of a specific tech, as if
installed in a virtual environment all two listed are void anyway - you do not
want to suggest that an user adds two disks to the PMG hosted VM (maybe even backed
by the same storage) and setups a RAID-.. there :-D

> Aren't you refereing with 'best with HW raid' to the removed section?

no, to the by you added one...

> 
>>> +  hardware RAID controller. For best performance use Enterprise class SSD with
>>> +  ower loss protection.
>>
>> s/ower/power/
> Thanks for spotting.
>