发明名称 |
SNAPSHOT OF DATA STORED ON A MASS STORAGE SYSTEM |
摘要 |
A method for providing a static snapshot, or image, of data stored on a mass storage system (104). At the start of the method, a preservation memory (106) is cleared and a virtual device is created. Whenever a write is to be performed on the mass storage system (104), a check is made of the preservation memory (106) to determine if it contains a block associated with the mass storage write address. If there is not, a copy of the block in the mass storage system (104) at the block write address is placed in the preservation memory (106). Whenever a read is to be performed on the virtual device, a check is made of the preservation memory (106) to determine if it contains a block associated with the virtual device read address. If there is such a block, that block is returned as the result of the virtual device read. Otherwise, the block at the virtual device block read address is returned as the result. |
申请公布号 |
WO9612232(A1) |
申请公布日期 |
1996.04.25 |
申请号 |
WO1995US13324 |
申请日期 |
1995.10.10 |
申请人 |
VINCA CORPORATION;OHRAN, RICHARD, S.;OHRAN, MICHAEL, R. |
发明人 |
OHRAN, RICHARD, S.;OHRAN, MICHAEL, R. |
分类号 |
G06F11/14;(IPC1-7):G06F12/16;G06F12/08 |
主分类号 |
G06F11/14 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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