23 Oct
2020
23 Oct
'20
7:25 p.m.
Yes the UEFI problem with mirrored mdraid boot is well-documented. I’ve generally been
working with BIOS partition maps which do not have the single point of failure UEFI has
(/boot can be mounted as mirrored, any of them can be used as non-RAID by GRUB). But BIOS
maps have problems as well with volume size.
That said, the disks are portable at that point and really don’t have deep performance
bottlenecks because mirroring and striping is cheap.
Sent from my iPhone
> On Oct 23, 2020, at 03:54, Eneko Lacunza <elacunza(a)binovo.es> wrote:
>
> Hi Brian,
>
>> El 22/10/20 a las 18:41, Brian Topping escribió:
>>
>>>> On Oct 22, 2020, at 10:34 AM, Anthony D'Atri
<anthony.datri(a)gmail.com> wrote:
>>>
>>>> - You must really be sure your raid card is dependable. (sorry but I
have seen so much management problems with top-tier RAID cards I avoid them like the
plague).
>>> This.
>> I’d definitely avoid a RAID card. If I can do advanced encryption with an MMX
instruction, I think I can certainly trust IOMMU to handle device multiplexing from
software in an efficient manner, no? mdadm RAID is just fine for me and is reliably
bootable from GRUB.
>>
>> I’m not an expert in driver mechanics, but mirroring should be very low overhead
at the software level.
>>
>> Once it’s software RAID, moving disks between chassis is a simple process as
well.
>>
>> Apologies I didn’t make that clear earlier...
> Yes, I really like mdraid :) . Problem is BIOS/UEFI has to find a working bootable
disk. I think some BIOS/UEFIs have settings for a secondary boot/UEFI bootfile, but that
would have to be prepared and maintained manually, out of the mdraid10; and would only
work with a total failure of the primary disk.
>
> Cheers
>
> --
> Eneko Lacunza | +34 943 569 206
> | elacunza(a)binovo.es
> Zuzendari teknikoa | https://www.binovo.es
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