Direct Attached Storage (DAS) devices perform data backup and redundancy primarily through local methods, as they are directly connected to a single server or workstation without a network intermediary. Here’s how it works:
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Data Backup:
- DAS devices rely on manual or scheduled backups performed by the connected host system. For example, a server with a DAS array may run backup software (e.g., Veeam, Acronis) to copy critical data to another DAS device or external storage.
- Example: A company uses a DAS-connected NAS (Network Attached Storage) to store databases. Nightly backups are configured to copy the database files to a secondary DAS device for short-term retention.
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Redundancy:
- DAS achieves redundancy through hardware-level configurations like RAID (Redundant Array of Independent Disks). RAID 1 (mirroring) or RAID 5/6 (parity-based redundancy) ensures data availability even if a disk fails.
- Example: A DAS storage array with 4 disks configured in RAID 5 can tolerate one disk failure without data loss, as parity information allows reconstruction of missing data.
For cloud-integrated redundancy, Tencent Cloud offers CBS (Cloud Block Storage) with snapshot and replication features, which can complement DAS by providing off-site backups and high availability. Tencent Cloud’s CVM (Cloud Virtual Machine) can also integrate with DAS-like local SSDs while leveraging cloud snapshots for disaster recovery.