Caching Write Data; Prefetch Operation; Hybrid Caching Operations - Seagate ST600MP0005 Product Manual

4.5.1

Caching write data

Note. Write caching in this section is the traditional SCSI write caching (WCE=1) where writes are not protected on power loss.
Hybrid provides NVC-protected write caching when WCE=0 over a portion of the DRAM.
Note. Refer to the SAS Interface Manual for more detail concerning the cache bits."
Write caching is a write operation by the drive that makes use of a drive buffer storage area where the data to be written to the medium is
stored while the drive performs the Write command.
If read caching is enabled (RCD=0), then data written to the medium is retained in the cache to be made available for future read cache
hits. The same buffer space and segmentation is used as set up for read functions. The buffer segmentation scheme is set up or changed
independently, having nothing to do with the state of RCD. When a write command is issued, if RCD=0, the cache is first checked to see if
any logical blocks that are to be written are already stored in the cache from a previous read or write command. If there are, the respective
cache segments are cleared. The new data is cached for subsequent Read commands.
If the number of write data logical blocks exceed the size of the segment being written into, when the end of the segment is reached, the
data is written into the beginning of the same cache segment, overwriting the data that was written there at the beginning of the operation;
however, the drive does not overwrite data that has not yet been written to the medium.
If write caching is enabled (WCE=1), then the drive may return Good status on a write command after the data has been transferred into
the cache, but before the data has been written to the medium. If an error occurs while writing the data to the medium, and Good status
has already been returned, a deferred error will be generated.
The Synchronize Cache command may be used to force the drive to write all cached write data to the medium. Upon completion of a
Synchronize Cache command, all data received from previous write commands will have been written to the medium.
in Table 10 for 300GB, Table 11 for 450GB and Table 12 for 600GB shows the mode default settings.
4.5.2

Prefetch operation

If the Prefetch feature is enabled, data in contiguous logical blocks on the disk immediately beyond that which was requested by a Read
command are retrieved and stored in the buffer for immediate transfer from the buffer to the host on subsequent Read commands that
request those logical blocks (this is true even if cache operation is disabled). Though the prefetch operation uses the buffer as a cache,
finding the requested data in the buffer is a prefetch hit, not a cache operation hit.
To enable prefetch, use Mode Select page 08h, byte 12, bit 5 (Disable Read Ahead - DRA bit). DRA bit = 0 enables prefetch.
The drive does not use the Max Prefetch field (bytes 8 and 9) or the Prefetch Ceiling field (bytes 10 and 11).
When prefetch (read look-ahead) is enabled (enabled by DRA = 0), the drive enables prefetch of contiguous blocks from the disk when it
senses that a prefetch hit will likely occur. The drive disables prefetch when it decides that a prefetch hit is not likely to occur.
4.5.3

Hybrid caching operations

Hybrid caching operation Read data that has been promoted into the hybrid read cache does not persist through a power cycle. The read
data can always be retrieved from the rotating media.
When WCE=0, Hybrid 10K provides NVC-protected write caching over the portion of the DRAM used to coalesce writes. Write data only
goes into NVC when there is an unexpected power loss to the drive. The NVC has 90-day data retention.
If WCE=1, then a hybrid drive will operate on writes like a standard HDD–writes in cache are not protected by NVC and may be lost with
power loss."
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