Adaptec 2074700-R User Guide - Page 125
Sync. Transfer, Sync. Transfer Rate, Disconnect, Disk Read Cache / Disk Write Cache / Tagged Queues
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ICP RAID Console Caution: Disk initialization can destroy all data on the hard disk. ICPCON copies ICP RAID controller specific configuration blocks on the hard disk, a primary block and a mirrored secondary block. You should always check that they are all "Enabled" or "On". If the hard disk you have selected is an Ultra160 device and the ICP RAID controller has Ultra160 SCSI channels, Advanced Configuration allows you to configure the so-called Domain Validation (a cyclical check of the correct data transfer at a given rate). Normally this parameter is Off. The SCSI bus can operate two methods of data transfer: asynchronous and synchronous. Each SCSI device must be able to perform the first type of transfer, the second type is optional. The advantage of the synchronous transfer is a higher data transfer rate, since the signal transfer times on the possibly long SCSI cable have no influence on the transfer rate. This mode is only effective if both devices support synchronous transfer and can communicate with each other in this mode. Sync. Transfer This parameter disables or enables synchronous data transfer. Sync. Transfer Rate This is the synchronous data transfer rate in MB/s. Ultra160 SCSI allows up to 160 MB/s. If a SCSI cable does not permit a certain transfer rate, the transfer rate can be reduced to a value that permits trouble-free data transfer. Lowering the transfer rate may also become necessary when using a configuration which does not allow full speed. See Figure 10-71. Disconnect You can connect several components to a SCSI bus. It is particularly important to guarantee a high degree of overlapping action on the SCSI bus. This high degree of overlapping becomes possible when a SCSI device has Disconnect enabled. Disk Read Cache / Disk Write Cache / Tagged Queues For performance reasons, the read ahead and write cache of the hard disk should be always On. Tagged Queues is a SCSI feature which allows the drive to execute more than one command at a time. If available, it should also be On. If you leave this configuration form by pressing and you have made changes, ICPCON displays a security request. The warning of the destruction of all data (Figure 10-72) may require different evaluations, depending on the device's current state and the options you selected. Figure 10-72. Disk Initialization Confirmation Note: If this operation is the first initialization of the device, for example, the drive was previously connected to a different controller, all data will be lost. If the device has already been initialized, and only internal parameters such as Disconnect, Synchronous Software Installation and User's Guide 125