external multipath disk not mounted after power off/on the server

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Dear cephers, 


We have a series of devices that mount several SATA disks via an external cabinet. These disks have 4 paths managed by multipath. (local disks about 20 work perfectly) 




cephosd23:~ # multipath -ll 
mpathe (35000c500d88657e3) dm-30 LENOVO-X,ST14000NM004J 
size=13T features='0' hwhandler='0' wp=rw 
|-+- policy='service-time 0' prio=1 status=active 
| `- 2:0:9:0 sdae 65:224 active ready running 
|-+- policy='service-time 0' prio=1 status=enabled 
| `- 2:0:21:0 sdap 66:144 active ready running 
|-+- policy='service-time 0' prio=1 status=enabled 
| `- 2:0:33:0 sdba 67:64 active ready running 
`-+- policy='service-time 0' prio=1 status=enabled 
`- 2:0:45:0 sdbl 67:240 active ready running 
mpathd (35000c500d886ac87) dm-23 LENOVO-X,ST14000NM004J 
size=13T features='0' hwhandler='0' wp=rw 
|-+- policy='service-time 0' prio=1 status=active 
| `- 2:0:2:0 sdx 65:112 active ready running 
|-+- policy='service-time 0' prio=1 status=enabled 
| `- 2:0:14:0 sdai 66:32 active ready running 
|-+- policy='service-time 0' prio=1 status=enabled 
| `- 2:0:26:0 sdat 66:208 active ready running 
`-+- policy='service-time 0' prio=1 status=enabled 
`- 2:0:38:0 sdbe 67:128 active ready running 
mpathc (35000c500d87a5c5f) dm-20 LENOVO-X,ST14000NM004J 




The disks are accessible from the server, but Ceph has not been able to mount them and they are not accessible from Ceph. 

... 

tmpfs 126G 0 126G 0% /var/lib/ceph/osd/ceph-110 

tmpfs 126G 0 126G 0% /var/lib/ceph/osd/ceph-113 

tmpfs 126G 0 126G 0% /var/lib/ceph/osd/ceph-112 
the directory is empty and of course: 
/usr/bin/ceph-osd -f --cluster ceph --id 110 --setuser ceph --setgroup ceph 
2025-02-27T15:22:25.833+0100 7f799db60d80 -1 auth: unable to find a keyring on /var/lib/ceph/osd/ceph-110/keyring: (2) No such file or directory 
2025-02-27T15:22:25.833+0100 7f799db60d80 -1 AuthRegistry(0x55841ec96940) no keyring found at /var/lib/ceph/osd/ceph-110/keyring, disabling cephx 
2025-02-27T15:22:25.833+0100 7f799db60d80 -1 auth: unable to find a keyring on /var/lib/ceph/osd/ceph-110/keyring: (2) No such file or directory 
2025-02-27T15:22:25.833+0100 7f799db60d80 -1 AuthRegistry(0x7ffd668863a0) no keyring found at /var/lib/ceph/osd/ceph-110/keyring, disabling cephx 



Is there any way to fix this error and mount them again? The data should be intact. 

Best regards 
-- 

================================================================ 
Ibán Cabrillo Bartolomé 
Instituto de Física de Cantabria (IFCA-CSIC) 
Santander, Spain 
Tel: +34942200969/+34669930421 
Responsible for advanced computing service (RSC) 
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