Quantum Corporation. Quantum Atlas 10K 9.1/18.2/36.4 GB SCSI product manual, Document number 81-11931305, August 1999. Home/Search Document Not in Database Summary Related Articles Check |
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Lachesis: Robust Database Storage Management Based on.. - Schindler, Ailamaki.. (2003) (2 citations) (Correct)
....ically determining efficient disk accesses. The increased efficiency of track aligned requests comes from a combination of three factors. First, a track aligned I O whose size is one track or less does not suffer a head switch, which, for modem disks, is equivalent to a 1 5 cylinder seek [26]. Second, a disk firmware technology known as zero latency access eliminates rotational latency by reading data off the track out of order as soon as the head is positioned. The on board disk cache buffers the data and sends it to the host in ascend ing order. Third, with several requests in the ....
Quantum Corporation. Quantum Atlas 10K 9.1/18.2/36.4 GB SCSIproduct manual, Document number 81-119313-05, August 1999.
Lachesis: Robust Database Storage Management Based on.. - Schindler, Ailamaki.. (2003) (2 citations) (Correct)
....Unfortunately, simple mechanisms like this are no longer possible without the architectural changes 4 proposed here, because of high level device interfaces and built in firmware functions. For example, zoned geometries and advanced defect management in current disks (e.g. Quantum Atlas 10k [25]) result in cylinders being composed of tracks with variable number of sectors (see Table 1) No single value for the number of sectors per track is correct across the device. 2.4 Exploiting Memory Hierarchy Characteristics For compute and memory intensive database applications, memory latency ....
....for automatically sizing efficient disk accesses. The increased efficiency of track aligned requests comes from a combination of three factors. First, a track aligned I O whose size is one track or less does not suffer a head switch, which, for modern disks, is equivalent to a 1 5 cylinder seek [25]. Second, a disk firmware technology known as zero latency access eliminates rotational latency by reading data off the track out oforder as soon as the head is positioned. The on board disk cache buffers the data and sends it to 6 the host in ascending order. Third, with several requests in the ....
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Quantum Corporation. Quantum Atlas 10K 9.1/18.2/36.4 GB SCSI product manual, Document number 81119313 -05, August 1999.
Freeblock Scheduling Outside of Disk Firmware - Lumb, Schindler, Ganger (2002) (13 citations) (Correct)
....8 compares the three external algorithms (SSTF, SPTF, and SPTF SW60 ) with the disk s in firmware scheduler. As expected, SPTF outperforms SPTF SW60 which outperforms SSTF, and the differences increase with larger queue depths. The external scheduler s SPTF matches the Atlas 10k s ORCA scheduler [20] (apparently an SPTF algorithm) indicating that their decisions are consistent. We observed the same consistency between the external scheduler s SPTF and the Chee tah 18LP s in firmware scheduler. 5.3 Freeblock scheduling effectiveness To evaluate the effectiveness of our external freeblock ....
Quantum Corporation. Quantum Atlas 10K 9.1/18.2/36.4 GB SCSI product manual, Document number 81-11931305, August 1999.
Track-aligned Extents: Matching Access Patterns to.. - Schindler, Griffin, .. (2002) (9 citations) (Correct)
....sector. Slipping is more efficient and more common, but it affects the mappings of subsequent LBNs. Although track detection can be difficult, it need be performed only once. Track boundaries only change in use if new defects grow on the disk, which is rare after the first 48 hours of operation [30]. 3.2 Allocation and access To utilize track boundary information, the algorithms for on disk placement and request generation must support variable sized extents. Extent based file systems, such as NTFS [28] and XFS [43] allocate disk space to files by specifying ranges of LBNs (extents) ....
Quantum Corporation. Quantum Atlas 10K 9.1/18.2/36.4 GB SCSI product manual, Document number 81-11931305, August 1999.
Blurring the Line Between OSes and Storage Devices - Ganger (2001) (7 citations) (Correct)
....regarding host caching policies and thus attempts to provide benefit with very little information. Since these host policies vary from system to system, drive level caching often provides only the benefits of sequential prefetching in practice. A third area of progress is in request scheduling [38, 46], where the drive has the most detailed information about access efficiency. As cost effective computation power has been incorporated into disk drives, they have been able to take advantage of the computation to make precise decisions about which requests to service next. Using algorithms that ....
Quantum Corporation. Quantum Atlas 10K 9.1/18.2/36.4 GB SCSI product manual, Document number 81119313 -05, August 1999. 16
Freeblock Scheduling Outside of Disk Firmware - Christopher Lumb Jiri (2002) (13 citations) (Correct)
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Quantum Corporation. Quantum Atlas 10K 9.1/18.2/36.4 GB SCSI product manual, Document number 81-11931305, August 1999.
Lachesis: Robust Database Storage Management Based on.. - Schindler, Ailamaki.. (2003) (2 citations) (Correct)
No context found.
Quantum Corporation. Quantum Atlas 10K 9.1/18.2/36.4 GB SCSI product manual, Document number 81-119313-05, August 1999.
Freeblock Scheduling Outside of Disk Firmware - Lumb, Schindler, Ganger (2001) (13 citations) (Correct)
No context found.
Quantum Corporation. Quantum Atlas 10K 9.1/18.2/36.4 GB SCSI product manual, Document number 81119313 -05, August 1999.
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