Drive Management

Managing Drives

The Drive Management page provides settings for managing storage and lets you apply global settings for drives on your px6-300d Network Storage.

Setting Write Caching

Select a value for disk write caching.

Write caching is a mechanism that attempts to separate the fast processing speed of the px6-300d from the relatively slow mechanics of actually writing data to drive.

With write caching disabled, every write to drive causes the px6-300d to wait while the data is written to drive, which can slow performance. When write caching is enabled and the px6-300d sends a write request to the drive, it writes the data to cache (which is much faster) and sends an immediate acknowledgement to the px6-300d saying the write is complete. The system proceeds without waiting for the data to actually get written to drive, which occurs in the background.

While write caching does improve performance, there are some risks. The system responds that the data is written to drive when in fact it has only been written to cache. Should the px6-300d lose power, any data not completely written to drive is lost forever.

This is because cache memory is volatile. If you lose power, the contents of the cache are lost. Therefore, if there were any pending writes in the cache that were not written to the drive, they will be lost forever. Using a UPS (Uninterrupted Power Supply) can mitigate the risk associated with write caching, which is why it is recommended to only enable this feature when a UPS is connected.

Applying Global Drive Management Settings

1.Click Settings.

2.Check Add drives to storage system to add a newly installed drive. You see this option only if there is at least one unused drive on the px6-300d.

3.To change the protection, choose a value from the drop-down menu:

●Mirror (RAID 1)

Uses half of the storage space for protection, leaving half for actual data.

●Mirror Stripe (RAID 10)

Uses half of the storage space for protection, leaving half for actual data.

●Parity (RAID 5)

Uses the space corresponding to one drive-size for protection, leaving remaining space for storing actual data.

●Double Parity (RAID 6)

Combines six or more drives in a way that protects data against loss of any two drives.

●Striped (RAID 0)

Distributes data across several drives in a way that gives improved speed at any given instant.

●None

Turns off data protection and leaves your data vulnerable to data loss.

4.Select a value for disk write caching.

58 Managing Drives

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Lenovo 70BG9000NA manual Managing Drives, Setting Write Caching, Applying Global Drive Management Settings, Click Settings
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