Monitoring Solid State Drives (Ssd) - IBM Midrange System DS4000 Series Hardware Manual
Midrange system storage ds4000/ds5000 series
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Also See for Midrange System DS4000 Series:
- Hardware maintenance manual (184 pages) ,
- Installation and user manual (84 pages) ,
- Planning and installation manual (44 pages)
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8. Restore data from backup or recreate any Volume Copy relationships by highlighting the
copy pairs in the Copy Manager (select Logical Drive VolumeCopy Copy
Manager) and selecting Copy Re-Copy.
It might also be possible to add redundancy by changing the RAID level if sufficient spare
drives are available. If successful, this alters the PFA risk level from high to medium, allowing
the disk to be replaced without disruption. However, there will be data loss if the affected disk
fails during this operation.
PFA warning on a disk in a degraded array
For the array to be in a degraded state, there must already be a failed disk when the PFA is
detected on another disk in the same array. Reconstruction to a hotspare might already be in
progress. Two replacement disks will be required. In this scenario, it is important to replace
the failed disk as soon as possible by performing the following steps:
1. Although not required, I/O to the affected logical drives should be stopped to reduce the
possibility of inducing a failure on the PFA disk before the failed disk is replaced.
2. If a standby hotspare drive is not available, replace the failed disk.
3. Monitor the progress of reconstruction on the affected logical drives or change the
reconstruction rate by highlighting the logical drive in the Logical View of the Subsystem
Management window and then selecting Logical Drive Properties. Note that after the
operation in progress has completed, the progress bar is no longer displayed in the
Properties dialog.
4. When all affected logical drives have returned to the Optimal status, the PFA risk level
reduces from high to medium. At this point, it safe to resume I/O to the affected logical
drives.
5. Highlight the PFA flagged drive in the Physical View of the Subsystem Management
window and select Advanced Recovery Fail Drive. The amber fault LED for the
affected disk illuminates. The affected logical drives become degraded until reconstruction
is complete.
6. Replace the failed drive(s).
7.9.3 Monitoring Solid State Drives (SSD)
When we look at the SSD drive properties in the Storage Manager Subsystem Management
physical view, we see some parameters that are unique to SSD drives (see Figure 7-70).
Figure 7-70 SSD drive properties
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