Brian, Eneko,
BTW, the Tyan LFF chassis we've been using has 12 x 3.5" bays in front
and 2 x 2.5" SATA bays in back. We've been using 240GB SSDs in the rear
bays for mirrored boot drives, so any NVMe we add is exclusively for OSD
support.
-Dave
Dave Hall
Binghamton University
kdhall@xxxxxxxxxxxxxx
607-760-2328 (Cell)
607-777-4641 (Office)
On 10/23/2020 11:55 AM, Brian Topping wrote:
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@xxxxxxxxx> 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@xxxxxxxxx> 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@xxxxxxxxx
Zuzendari teknikoa | https://www.binovo.es
Director técnico | Astigarragako Bidea, 2 - 2º izda.
BINOVO IT HUMAN PROJECT S.L | oficina 10-11, 20180 Oiartzun
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