Promise Technology VTRAK M610p Instrukcja Obsługi Pobierz pdf (Strona 214)

VTrak M610p Product Manual

202

• Linux operating systems with the 2.6 kernel support 64-bit LBA. For these

OSes, always choose the default 512 B sector size.

2 TB Limitation

If your Host PC runs Windows 2000 or Windows XP (32-bit), and you want to

create logical drives larger than 2TB, you must choose a sector size larger than

512 B when you create the logical drive. The table below correlates sector size

with logical drive capacity.

Because logical drives can be expanded, you may encounter a situation where

the usable capacity of your expanded logical drive is reduced by the addressing

issue described above. There are two alternatives:

• Limit your logical drive expansion to within the limits described in the chart.

• Back up your data, then delete your existing logical drive and create a new

one with a larger sector size.

Cache Policy

As it is used with VTrak, the term cache refers to any of several kinds of high-

speed, volatile memory that hold data moving from your computer to the physical

drives or vice-versa. Cache is important because it can read and write data much

faster than a physical drive. There are read caches, which hold data as it is read

from a physical drive; and write caches, which hold data as it is written to a

physical drive.

In order to tune the cache for best performance in different applications, user-

adjustable settings are provided. Cache settings are made in conjunction with

logical drives:

• When you create a logical drive. See “Creating a Logical Drive” on page 98

• On an existing logical drive. See “Making Logical Drive Settings” on

page 107

Read Cache Policy

• Read Cache – The read cache is enabled.

Logical Drive Size Sector Size

8 to 16 TB 4096 bytes (4 KB)

4 to 8 TB 2048 bytes (2 KB)

2 to 4 TB 1024 bytes (1 KB)

0 to 2 TB 512 bytes (512 B)

1 2 ... 209 210 211 212 213 214 215 216 217 218 219 ... 283 284

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