Question 182 of 144
SK0-005 server-administration Practice Question
Exhibit
Filesystem Size Used Avail Use% Mounted on /dev/sda1 20G 18G 1.5G 93% / /dev/sdb1 50G 10G 38G 21% /backup
Refer to the exhibit. A Linux server is reporting slow I/O on the root filesystem. Which of the following actions should the administrator take to resolve the immediate storage bottleneck?
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Move non-essential data from / to /backup.
Option B is correct because moving non-essential data from the nearly full root filesystem to /backup (which has ample space) quickly alleviates the space shortage and I/O pressure. Option A is wrong because resizing /dev/sda1 may require downtime and complex partitioning operations; it is not an immediate fix. Option C is wrong because deleting log files may free some space but might also delete valuable diagnostic data and may not be sufficient. Option D is wrong because changing the RAID level of /dev/sda is a fundamental hardware change that does not address the immediate space issue and could be destructive.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Move non-essential data from / to /backup.
Why this is correct
Offloading data to a volume with free space immediately reduces utilization on /, resolving the bottleneck without downtime.
- ✗
Delete log files in /var/log.
Why it's wrong here
While it frees space, it might not free enough, and removing logs hampers troubleshooting and auditing.
- ✗
Resize /dev/sda1 to 30G.
Why it's wrong here
Resizing requires unmounting or rebooting and is not a quick solution; also, the root partition may be LVM-based or not easily extended online.
- ✗
Change the RAID level of /dev/sda.
Why it's wrong here
RAID level changes are unrelated to free space management and could introduce additional I/O load or data loss risk.
Visual reference
Quick reference
RAID Level Comparison
| RAID Level | Min Disks | Fault Tolerance | Read | Write | Usable Capacity |
|---|---|---|---|---|---|
| RAID 0 | 2 | None | Excellent | Excellent | 100% |
| RAID 1 | 2 | 1 disk | Good | Moderate | 50% |
| RAID 5 | 3 | 1 disk | Good | Moderate | 67–94% |
| RAID 6 | 4 | 2 disks | Good | Lower | 50–88% |
| RAID 10 | 4 | 1 disk per mirror | Excellent | Good | 50% |
RAID is not a backup strategy — it protects against disk failure but not against accidental deletion, ransomware, or site-level events.
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Last reviewed: Jul 26, 2026
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