Data transfer control of virtual storage supported by three-leve

Details Data transfer control of virtual storage supported by three-leve Data transfer control of virtual storage supported by three-leve

1993-08-05

1996-11-26

Asta, Frank J.

Boots, shoes, and leggings

395413, 395444, 395492, 39549701, 39549704, 3642443, 3642452, 36424611, 3642465, 3642563, 3642602, 3649642, 364DIG1, G06F 1300

Patent

active

055795072

ABSTRACT:
In a storage control method for use in a computer system having a main storage, a first external storage, and a second external storage having an access speed higher than that of the first external storage, a check is made for a free area of the second external storage to decide a size of the free area. The size is compared with a predetermined first reference value. If the size is smaller, to prepare a free area having a size not less than the first reference value, the storage contents are transferred from the second external storage to the first external storage. If the free area size is larger than the first reference value, the size is next compared with a predetermined second reference value greater than the first reference value. If the size is larger than the first reference value and smaller than the second reference value, a predetermined amount of the storage contents are transferred from the second external storage to the first external storage.

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Katada, Hisashi, et al. "Paging Algorithm Using Extended Storage--Its Design and Evaluation," The Information Processing Society, OS Study Group, Mar. 15, 1991, pp. 1-8. (Provided in Japanese with English Abstract.).
Hitachi Manual, "Center Operation," (6180-3-101-10), pp. 130-133. (Japanese).

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