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Subject: Re: [PVE-User] Dell PowerEdge T140, megaraid, BIOS Boot...
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Subject: Re: [PVE-User] Dell PowerEdge T140, megaraid, BIOS Boot...
To: Proxmox VE user list <pve-user@lists.proxmox.com>
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hello,
there is a note at https://pve.proxmox.com/wiki/Roadmap#Proxmox_VE_8.2
Kernel: |intel_iommu| now defaults to on
The |intel_iommu| parameter defaults to |on| in the kernel 6.8 series.=20
Enabling IOMMU can cause problems with older hardware, or systems with=20
not up to date BIOS, due to bugs in the BIOS.
The issue can be fixed by explicitly disabling |intel_iommu| on the=20
kernel commandline (|intel_iommu=3Doff|) following the reference=20
documentation=20
<https://pve.proxmox.com/pve-docs/chapter-sysadmin.html#sysboot_edit_kerne=
l_cmdline>.=20
does intel_iommu=3Doff also help ?
regards
Roland
Am 02.05.25 um 17:21 schrieb Marco Gaiarin:
> I've just upgraded to PVE8 a little cluster built with an PowerEdge T340
> (boot in UEFI mode) and an T140 (boot in BIOS mode).
>
> T340 works like a charme; T140 after rebooting panicked because cannot f=
ind
> root filesystem; looking carefully at kernel log revealed that disks get=
not
> recognized, and going deeper lead me to:
>
> gaio@leia:~$ grep megaraid T140_boot_log.txt
> [ 31.952470] megaraid_sas 0000:01:00.0: FW now in Ready state
> [ 31.952472] megaraid_sas 0000:01:00.0: 63 bit DMA mask and 32 bit c=
onsistent mask
> [ 31.952624] megaraid_sas 0000:01:00.0: firmware supports msix =
: (96)
> [ 31.952750] megaraid_sas 0000:01:00.0: requested/available msix 5/5=
poll_queue 0
> [ 31.952752] megaraid_sas 0000:01:00.0: current msix/online cpus =
: (5/4)
> [ 31.952753] megaraid_sas 0000:01:00.0: RDPQ mode : (disabled)
> [ 31.952758] megaraid_sas 0000:01:00.0: Current firmware supports ma=
ximum commands: 928 LDIO threshold: 237
> [ 31.954076] megaraid_sas 0000:01:00.0: Performance mode :Latency (l=
atency index =3D 1)
> [ 31.954078] megaraid_sas 0000:01:00.0: FW supports sync cache =
: No
> [ 31.954080] megaraid_sas 0000:01:00.0: megasas_disable_intr_fusion =
is called outbound_intr_mask:0x40000009
> [ 32.362294] megaraid_sas 0000:01:00.0: Ignore DCMD timeout: megasas=
_get_ctrl_info 5382
> [ 32.665126] megaraid_sas 0000:01:00.0: Could not get controller inf=
o. Fail from megasas_init_adapter_fusion 1907
> [ 32.908139] megaraid_sas 0000:01:00.0: Failed from megasas_init_fw =
6539
>
> googling a bit lead me to some forum and pages; after some test i've add=
ed
> to kernel boot parameters:
>
> iommu=3Dpt
>
> and now server boot flawlessy.
>
>
> The two servers have different hardware but share the same BIOS, so this
> lead to me to the hypotesis that the new megaraid_sas kernel driver depe=
nd
> on UEFI initialization to work, or something like this.
>
> Also, i've understood that 'pt' mean 'PassThrought', but i've not clear =
what
> overral consequences (performance, stability, ...) have this options.
>
>
> I'm seeking feedback. Thanks.
>
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