Managing Drives
The Drive Management page provides settings for managing storage and lets you apply global settings for
drives on your px4-300d 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 px4-300d from
the relatively slow mechanics of actually writing data to drive.
With write caching disabled, every write to drive causes the px4-300d to wait while the data is written to
drive, which can slow performance. When write caching is enabled and the px4-300d sends a write request
to the drive, it writes the data to cache (which is much faster) and sends an immediate acknowledgement
to the px4-300d 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 px4-300d 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 px4-300d.
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.
●
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.
Drive Management
58
Managing Drives
Содержание EMC PX4-300D
Страница 1: ...px4 300d Network Storage with LifeLine 4 0 User Guide ...
Страница 11: ...Setting up Your px4 300d Network Storage Setting up Your px4 300d Network Storage 1 CHAPTER 1 ...
Страница 32: ...Sharing Files Sharing Files 22 CHAPTER 2 ...
Страница 56: ...Storage Pool Management Storage Pool Management 46 CHAPTER 4 ...
Страница 67: ...Drive Management Drive Management 57 CHAPTER 5 ...
Страница 70: ...Backing up and Restoring Your Content Backing up and Restoring Your Content 60 CHAPTER 6 ...
Страница 112: ...Sharing Content Using Social Media Sharing Content Using Social Media 102 CHAPTER 10 ...
Страница 118: ...Media Management Media Management 108 CHAPTER 11 ...
Страница 130: ... Delete a torrent job Click to delete the torrent download Media Management Torrents 120 ...
Страница 139: ...Upgrading Your px4 300d Network Storage Upgrading Your px4 300d Network Storage 129 CHAPTER 13 ...
Страница 144: ...Hardware Management Hardware Management 134 CHAPTER 15 ...
Страница 154: ...Additional Support AdditionalSupport 144 ...
Страница 157: ...Legal Legal 147 ...