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The_Great_Sephiroth
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PostPosted: Wed Apr 25, 2018 9:21 pm    Post subject: OK, what did I forget? Reply with quote

I have an odd issue with a PowerEdge T20, and I am assuming I left something out, but cannot figure out what. The internal SATA uses the "ahci" driver, which is built-in, as-is SCSI support and such. BTRFS is built-in as well. There are two disks (sda and sdb) and they have mirrored setups. I have BTRFS RAID1 on sda2/sdb2 and on sda4/sdb4. The EFI partition is sda1 and a backup on sdb1, and sda3 and sdb3 are swap partitions.I have built-in all hardware drivers, including the EDAC driver for the ECC RAM. No audio on this server, it is a pure server. Graphics appear to work, but after GRUB kicks off the boot sequence I get a kernel panic about being unable to mount root on unknown 8,2 or something along those lines. My kernel configuration can be found at the link below. I am also posting the output of "lspci -knn" and "lsmod" from System Rescue CD.

Kernel Configuration

lspci -knn:
Code:

root@sysresccd /root % lspci -knn
00:00.0 Host bridge [0600]: Intel Corporation Xeon E3-1200 v3 Processor DRAM Controller [8086:0c08] (rev 06)
        Subsystem: Dell Xeon E3-1200 v3 Processor DRAM Controller [1028:0620]
        Kernel driver in use: ie31200_edac
        Kernel modules: ie31200_edac
00:02.0 VGA compatible controller [0300]: Intel Corporation Xeon E3-1200 v3 Processor Integrated Graphics Controller [8086:041a] (rev 06)
        Subsystem: Dell Xeon E3-1200 v3 Processor Integrated Graphics Controller [1028:0620]
        Kernel driver in use: i915
        Kernel modules: i915
00:14.0 USB controller [0c03]: Intel Corporation 8 Series/C220 Series Chipset Family USB xHCI [8086:8c31] (rev 04)
        Subsystem: Dell 8 Series/C220 Series Chipset Family USB xHCI [1028:0620]
        Kernel driver in use: xhci_hcd
00:16.0 Communication controller [0780]: Intel Corporation 8 Series/C220 Series Chipset Family MEI Controller #1 [8086:8c3a] (rev 04)
        Subsystem: Dell 8 Series/C220 Series Chipset Family MEI Controller [1028:0620]
        Kernel driver in use: mei_me
        Kernel modules: mei_me
00:16.3 Serial controller [0700]: Intel Corporation 8 Series/C220 Series Chipset Family KT Controller [8086:8c3d] (rev 04)
        Subsystem: Dell 8 Series/C220 Series Chipset Family KT Controller [1028:0620]
        Kernel driver in use: serial
00:19.0 Ethernet controller [0200]: Intel Corporation Ethernet Connection I217-LM [8086:153a] (rev 04)
        Subsystem: Dell Ethernet Connection I217-LM [1028:05a6]
        Kernel driver in use: e1000e
        Kernel modules: e1000e
00:1a.0 USB controller [0c03]: Intel Corporation 8 Series/C220 Series Chipset Family USB EHCI #2 [8086:8c2d] (rev 04)
        Subsystem: Dell 8 Series/C220 Series Chipset Family USB EHCI [1028:0620]
        Kernel driver in use: ehci-pci
00:1c.0 PCI bridge [0604]: Intel Corporation 8 Series/C220 Series Chipset Family PCI Express Root Port #1 [8086:8c10] (rev d4)
        Kernel driver in use: pcieport
        Kernel modules: shpchp
00:1c.1 PCI bridge [0604]: Intel Corporation 8 Series/C220 Series Chipset Family PCI Express Root Port #2 [8086:8c12] (rev d4)
        Kernel driver in use: pcieport
        Kernel modules: shpchp
00:1d.0 USB controller [0c03]: Intel Corporation 8 Series/C220 Series Chipset Family USB EHCI #1 [8086:8c26] (rev 04)
        Subsystem: Dell 8 Series/C220 Series Chipset Family USB EHCI [1028:0620]
        Kernel driver in use: ehci-pci
00:1f.0 ISA bridge [0601]: Intel Corporation C226 Series Chipset Family Server Advanced SKU LPC Controller [8086:8c56] (rev 04)
        Subsystem: Dell C226 Series Chipset Family Server Advanced SKU LPC Controller [1028:0620]
        Kernel driver in use: lpc_ich
        Kernel modules: lpc_ich
00:1f.2 SATA controller [0106]: Intel Corporation 8 Series/C220 Series Chipset Family 6-port SATA Controller 1 [AHCI mode] [8086:8c02] (rev 04)
        Subsystem: Dell 8 Series/C220 Series Chipset Family 6-port SATA Controller 1 [AHCI mode] [1028:0620]
        Kernel driver in use: ahci
00:1f.3 SMBus [0c05]: Intel Corporation 8 Series/C220 Series Chipset Family SMBus Controller [8086:8c22] (rev 04)
        Subsystem: Dell 8 Series/C220 Series Chipset Family SMBus Controller [1028:0620]
        Kernel driver in use: i801_smbus
        Kernel modules: i2c_i801
02:00.0 PCI bridge [0604]: Texas Instruments XIO2001 PCI Express-to-PCI Bridge [104c:8240]
        Kernel modules: shpchp

lsmod:
Code:

root@sysresccd /root % lsmod
Module                  Size  Used by
binfmt_misc            16384  1
intel_rapl             20480  0
dell_wmi               16384  0
x86_pkg_temp_thermal    16384  0
intel_powerclamp       16384  0
sparse_keymap          16384  1 dell_wmi
dell_smbios            16384  1 dell_wmi
coretemp               16384  0
mei_wdt                16384  0
crct10dif_pclmul       16384  0
iTCO_wdt               16384  0
iTCO_vendor_support    16384  1 iTCO_wdt
crc32_pclmul           16384  0
crc32c_intel           20480  0
dcdbas                 16384  1 dell_smbios
ghash_clmulni_intel    16384  0
intel_cstate           16384  0
intel_uncore           81920  0
intel_rapl_perf        16384  0
serio_raw              16384  0
fjes                   28672  0
tpm_tis                16384  0
tpm_tis_core           20480  1 tpm_tis
i2c_i801               20480  0
shpchp                 32768  0
mei_me                 24576  0
lpc_ich                24576  0
tpm                    32768  2 tpm_tis,tpm_tis_core
mei                    77824  3 mei_me,mei_wdt
ie31200_edac           16384  0
i2c_smbus              16384  1 i2c_i801
edac_core              36864  1 ie31200_edac
raid10                 40960  0
raid456                81920  0
async_raid6_recov      16384  1 raid456
async_pq               16384  2 raid456,async_raid6_recov
async_xor              16384  3 async_pq,raid456,async_raid6_recov
async_memcpy           16384  2 raid456,async_raid6_recov
async_tx               16384  5 async_xor,async_pq,raid456,async_memcpy,async_raid6_recov
raid1                  32768  0
raid0                  20480  0
multipath              16384  0
linear                 16384  0
uas                    20480  0
usb_storage            61440  1 uas
i915                  942080  1
drm_kms_helper        102400  1 i915
drm                   249856  3 i915,drm_kms_helper
e1000e                184320  0
wmi                    16384  1 dell_wmi
i2c_algo_bit           16384  1 i915
video                  36864  2 dell_wmi,i915
ptp                    20480  1 e1000e
pps_core               16384  1 ptp

Did I forget something?
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Ant P.
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PostPosted: Thu Apr 26, 2018 3:12 am    Post subject: Reply with quote

Unless something's changed recently (~2yrs), the kernel isn't smart enough to boot off a btrfs raid root. You'll need an initramfs to `btrfs device scan` it then mount it.
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The_Great_Sephiroth
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PostPosted: Thu Apr 26, 2018 2:00 pm    Post subject: Reply with quote

Odd, I do not need one for the small NAS I built at home. I can add one though, it's simple enough. Will we ever get around having to create and maintain an initramfs for RAID setups? It's one extra thing to worry with when upgrading kernel versions and the like which I would rather do without.
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Ant P.
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PostPosted: Thu Apr 26, 2018 3:12 pm    Post subject: Reply with quote

Does the NAS have anything special in /proc/cmdline for it? Maybe that's missing here.
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The_Great_Sephiroth
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PostPosted: Thu Apr 26, 2018 8:50 pm    Post subject: Reply with quote

No, nothing. That's why I assumed it would work here. No problem though, I created the initramfs and all is good now.
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