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Redis Persistence: RDB vs AOF Configuration

Redis Persistence: RDB vs AOF Configuration

Choose and tune Redis persistence: RDB snapshot triggers, AOF fsync policies, the hybrid RDB-preamble format and how to verify recovery behaviour.

admin admin 2026-09-15
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Elasticsearch Red/Yellow: Unassigned Shards Fix

Elasticsearch Red/Yellow: Unassigned Shards Fix

Fix red and yellow Elasticsearch clusters: read cluster health, find unassigned shards, use the allocation explain API and clear the real causes.

admin admin 2026-09-15
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HPE 3PAR CLI: createvv, createhost and VLUNs

HPE 3PAR CLI: createvv, createhost and VLUNs

Provision HPE 3PAR/Primera storage from the CLI: make CPGs and thin volumes, create hosts with the right persona, and present VLUNs correctly.

admin admin 2026-09-15
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Dell PowerStore pstcli: Volume Provisioning Guide

Dell PowerStore pstcli: Volume Provisioning Guide

Provision Dell PowerStore storage with pstcli: create volumes and hosts, map LUNs, verify with show commands, and script it against the REST API.

admin admin 2026-09-15
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NetApp ONTAP SnapMirror: Break, Resync and Policies

NetApp ONTAP SnapMirror: Break, Resync and Policies

Manage ONTAP SnapMirror relationships: choose a policy, run update and quiesce, break for DR tests, then resync safely without losing snapshots.

admin admin 2026-09-15
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ONTAP Volume Move: Cutover and Troubleshooting

ONTAP Volume Move: Cutover and Troubleshooting

Move an ONTAP FlexVol between aggregates safely: target-aggregate checks, volume move start and show, trigger-cutover, cutover windows and failure rec

admin admin 2026-09-14
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smartctl and smartd: Catch Failing Disks Early

smartctl and smartd: Catch Failing Disks Early

SMART done properly: the attribute columns that matter, HDD, SAS and NVMe failure predictors, smartd scheduling, Prometheus export and safe RAID repla

admin admin 2026-09-14
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NVMe over TCP: Target and Initiator Setup Guide

NVMe over TCP: Target and Initiator Setup Guide

Set up NVMe over TCP end to end: nvmet kernel target via nvmetcli, host NQN access control, nvme-cli discovery and connect, multipath failover and jum

admin admin 2026-09-14
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Ceph CRUSH Map: Device Classes and Custom Rules

Ceph CRUSH Map: Device Classes and Custom Rules

Use Ceph device classes (ssd, hdd, nvme) and CRUSH rules to land each pool on the right hardware, plus EC profiles, the upmap balancer and verificatio

admin admin 2026-09-14
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ZFS Send and Receive: Snapshot Replication Guide

ZFS Send and Receive: Snapshot Replication Guide

Replicate ZFS datasets end to end: recursive snapshots, incremental zfs send -R over SSH, raw sends for encrypted data, mbuffer tuning and stream veri

admin admin 2026-09-14
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