System Performance Tuning2002

d-cache  

DAC (dual-attachment concentrator)  

data blocks (UFS)  

data cache  

data encapsulation (Ethernet)  

data link (networks)  

data link address  

Data Link and Medium Access Control (DLMAC) group (Ethernet)  

data link layer (OSI model)  

data paths, bits  

data transfer patterns (networks)  

data transfer rates (TCP)  

databases, benchmarks  

DDR SDRAM modules  

DEC Alpha processors  

       memory page size  

decision support systems, benchmarking  

defect management, disks  

deferred acknowledgements (TCP)  

demand paging  

denial-of-service attacks, SYN flooding  

design issues

       applications, refactored code  

       NFS disk subsystems  

       processors  

       RAID arrays  

       subsystems  

       test design  

development time to runtime ratio (code tuning)  

differential signaling (SCSI)  

diminishing returns (code optimization)  

direct cache mapping  

direct memory access (DMA)  

Direct Rambus (RDRAM)  

directory entry (UFS)  

directory name lookup cache (DNLC)   2nd  

disabling  

disk arrays   [See RAID]

disk quotas  

disks

       access patterns  

       architecture  

       arrays  

       asynchronous writes compared to synchronous  

       average seek time  

       benchmarking

               hdparm  

               iozone  

               multiple pass results  

               tiobench  

       bottlenecks

               blocked processes  

               locating  

       burst speed  

       caches  

               enabling  

       cluster size (UFS)  

       defect management  

       distributed parity-protected striping (RAID)  

       elevator algorithms  

       Fibre Channel  

       Hamming code arrays (RAID)  

       high I/O skew  

       high service time problems  

       internal transfer speed  

               compared to real speed  

       logical volumes  

       megabyte, size of  

       minfree parameter  

       mirrored striping (RAID)  

       mirroring  

               disk replacement  

       MTBF (Mean Time Between Failure)  

       MTTDI (Mean Time To Data Inaccessibility)  

       MTTDL (Mean Time To Data Loss)  

       MTTR (Mean Time To Repair)  

       NFS  

       paging and swapping problems  

       parity-protected striping (RAID)  

       parity-protected striping with independent disks (RAID)  

       partition statistics  

       performance monitoring tools, iostat  

       RAID levels  

               distributed parity-protected striping  

               Hamming code arrays  

               mirrored striping  

               mirroring  

               overview  

               parity-protected striping  

               parity-protected striping with independent disks  

               striping  

       random access and storage capacity issues  

       read/write latency  

       reads  

       rotational delay parameter  

       RPS misses  

       seek times, reducing  

       specifications  

       spindle synchronization   2nd  

       string utilization  

       striping (RAID)  

       web servers  

       workgroup servers and  

       write throttling  

       writes  

       ZBR (zone bit rate recording)  

dispadmin command, process scheduling  

dispatch queue, kernel threads  

dispatch tables, tuning  

distributed parity-protected striping  

DMA (direct memory access)  

DNLC (directory name lookup cache)   2nd  

doubly indirect blocks (filesystems)  

DRAM (dynamic random access memory)  

dual-attachment concentrator (DAC)  

duplex mode  

dynamic performance analysis  

dynamic priority  

dynamic random access memory (DRAM)