Руководство Пользователя для Spectra Logic spectra t120
Chapter 2. Architecture Overview
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Entry/Exit Pools and Storage Pools
Inside the library, media is logically grouped through the use of pools. Just like the
library is logically partitioned, media is logically grouped. The grouping depends on
the state of the media—whether it is available for storing data, or whether it is newly
imported or ready to be exported from the library.
library is logically partitioned, media is logically grouped. The grouping depends on
the state of the media—whether it is available for storing data, or whether it is newly
imported or ready to be exported from the library.
When the library is configured, each partition is assigned a certain number of slots
(i.e., assigned chambers, one per TeraPack case) within the library for each pool—
either the EE pool or the storage pool.
(i.e., assigned chambers, one per TeraPack case) within the library for each pool—
either the EE pool or the storage pool.
• The storage pool is used by the backup software for backups and restores.
• The EE pool is used for newly imported media, and for media ready to be exported.
In this way, exported media isn’t stored in a physical EE port; rather, it’s stored in an
internal EE pool. When it is time to remove media from a library, all the operator has to
do is use the library’s front panel (LC) to eject media in a TeraPack case or RXT media
pack, rather than open a loaded EE port. Together, the EE pool and the TAP function as
a configurable EE port.
internal EE pool. When it is time to remove media from a library, all the operator has to
do is use the library’s front panel (LC) to eject media in a TeraPack case or RXT media
pack, rather than open a loaded EE port. Together, the EE pool and the TAP function as
a configurable EE port.
For example, assume a typical backup needs to export 300 cartridges or 30 media
packs. To handle this, you can assign 30 chambers to the EE pool. With this, all 300
cartridges or 30 media packs can be handled with a single export command from the
backup software. This is impossible in a traditional library; typically, backup software
issues a delay or error when it needs to export more cartridges than the EE port
handles.
packs. To handle this, you can assign 30 chambers to the EE pool. With this, all 300
cartridges or 30 media packs can be handled with a single export command from the
backup software. This is impossible in a traditional library; typically, backup software
issues a delay or error when it needs to export more cartridges than the EE port
handles.
This greatly speeds tape cartridge exports, since the library exports one TeraPack case
per TAP—that is, 20 LTO or SAIT tapes at a time, 18 SDLT tapes at a time, or two RXT
media packs at a time—with the doors opening alternately. This way, the operator does
not have to handle individual cartridges. Similarly, imports are greatly sped up. Instead
of loading each tape into individual slots in the EE port, the library user logs onto the
physical library’s front panel, then inserts one TeraPack case per TAP until all TeraPack
cases are accepted, importing multiple cartridges per TeraPack case.
per TAP—that is, 20 LTO or SAIT tapes at a time, 18 SDLT tapes at a time, or two RXT
media packs at a time—with the doors opening alternately. This way, the operator does
not have to handle individual cartridges. Similarly, imports are greatly sped up. Instead
of loading each tape into individual slots in the EE port, the library user logs onto the
physical library’s front panel, then inserts one TeraPack case per TAP until all TeraPack
cases are accepted, importing multiple cartridges per TeraPack case.
In addition, the use of EE pools keeps TeraPack cases secure; no one can access the
media until a library user logs on to the physical library.
media until a library user logs on to the physical library.