| PRIMECLUSTER Global Disk Services Configuration and Administration Guide 4.1 (Linux) |
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| Appendix F Troubleshooting | > F.1 Resolving Problems |
The following description shows resolutions to problems relevant to system disks on which the file systems / (root), /usr, and /var operates.
In one of the following circumstances, take action as indicated for the relevant situation.
Mirroring the system disk will protect data in case one of the physical disks crashes. However, to restore data damaged by critical failures caused by multiple breakdown or misoperation, you must create backup data in advance.
See "Backing Up."
For some reason, the system disk data is invalid. You must restore data from the backup data created in advance.
See "Restoring (When the System Can Be Booted)."
Even when you have the system disk mirrored, you may experience unsuccessful booting. For example, you may encounter such a problem when the file accessed during the booting process in the boot disk is physically damaged, or when a disk is swapped improperly. If the console message of the unsuccessful boot disk indicates such is the case, try booting from the other boot disk, i.e. the mirror disk.
1) From boot disk units displayed in the EFI boot manager's boot option selector window, select a mirror disk and boot.
Among the SDX disk names, the top one is the original boot disk unit name and the others are the mirror disk names. When mirroring is configured with three-way or more multiplexing, multiple mirror disks exist. In the following example, Root1 is the original boot disk name and Root2 and Root3 are the mirror disk names.
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EFI Boot Manager ver 1.10 |
2) If booting is successful, find out what caused the original disk to fail, and recover the disk by swapping disks.
For details on disk swapping, see "sdxswap - Swap disk" and resolutions described in "Disk Swap."
When the procedures above cannot resolve the problem, causes other than data errors in the original boot disk unit may exist, or data errors may also exist in the mirror disk.
If it would appear that data errors also exist in the mirror disk, see "System cannot be booted (Boot disk data damage)."
For some reason, the system disk data is invalid. You must restore data from the backup data created in advance. If restoring data from the mirror disk was unsuccessful, follow the procedures shown below.
See "Restoring (When the System Cannot Be Booted)."
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