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#1
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number of outstanding FCP transfer ready
Is there a limit to the number of outstanding FCP transfer ready IUs on
a single exchange? If the limit is 1 then is the limited negotiated? Thanks |
#2
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number of outstanding FCP transfer ready
On Nov 29, 8:06 am, Granite Park wrote: Is there a limit to the number of outstanding FCP transfer ready IUs on a single exchange? If the limit is 1 then is the limited negotiated? In the case of FCP, the number of outstanding Transfer ready IUs is one. However, there could be more number of transfer rdy's provided by the device depending on various conditions of implementation for an I/O depending on the size of the I/O. In the case of iSCSI,the outstanding R2Ts which is equivalent to FCP Transfer rdy's is negotiable during the login phase. Hope this helps TK Thanks |
#3
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number of outstanding FCP transfer ready
Maybe the number of outstanding transfer ready's is exactly 1 due to the
transfer of sequence initiative to the other side in FCP. I agree that iSCSI provides a mechanism to negotiate a number 1, and this will be useful over high latency networks. On Nov 29, 8:06 am, Granite Park wrote: Is there a limit to the number of outstanding FCP transfer ready IUs on a single exchange? If the limit is 1 then is the limited negotiated? In the case of FCP, the number of outstanding Transfer ready IUs is one. However, there could be more number of transfer rdy's provided by the device depending on various conditions of implementation for an I/O depending on the size of the I/O. In the case of iSCSI,the outstanding R2Ts which is equivalent to FCP Transfer rdy's is negotiable during the login phase. Hope this helps TK Thanks |
#4
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number of outstanding FCP transfer ready
The number of transfer readys are not negotiated. Transfer readys are a bi
product of SCSI WRITE operations. Transfer size is typically bounded by the capabilities of the o/s kernel and HBA driver combination. Multiple transfer readys may occur during a single fibre channel exchange. The Moojit "Granite Park" wrote in message news:ceibh.15947$Uz.10868@trnddc05... Is there a limit to the number of outstanding FCP transfer ready IUs on a single exchange? If the limit is 1 then is the limited negotiated? Thanks |
#5
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number of outstanding FCP transfer ready
Moojit wrote: The number of transfer readys are not negotiated. Transfer readys are a bi product of SCSI WRITE operations. Transfer size is typically bounded by the capabilities of the o/s kernel and HBA driver combination. Multiple transfer readys may occur during a single fibre channel exchange. Transfer Ready's are issued by the target not the initiator. They are therefore NOT bounded by the OS/kernel or the HBA. Generally, they are bounded by buffering strategy and available buffer resources in the target. A useful (but perhaps not very realistic) example would be to consider a disk drive with an 8MB cache. If it write for 16MB is issued to the drive it will have to break that write up into 8MB (max) or lesser transfers in order to process the write command. Dave The Moojit |
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