Dell Products Inc.

Nomi Michaels

Jehuda Shemer

Ofir Ezrielev

Maxim Grabov

One example method includes receiving backup requests, creating a respective bitmap fragment for each backup request, each bitmap fragment corresponding to a respective tracking start time, for one of the requested backups, identifying a group of bitmap fragments that correspond to at timeframe extending from a time at which a previous backup was requested to a time at which the particular backup was requested, using the bitmap fragments of the group to create a consolidated bitmap that includes all changes to data in a volume resulting from IOs during the timeframe, with the consolidated bitmap, reading the data from the volume and transmit the data to a recipient, identifying new write IOs, received in parallel with transmission of the data, that are directed to data included in the particular backup, and reading, from the volume, the data to which the new write IOs are directed, and temporarily storing that data.

Efficient multiple concurrent backup LWD filter

One example method includes, in connection with receipt of a backup request, using a consolidated bitmap, that is associated either with multiple bitmap fragments or with multiple backup streams, to read data from a volume and transmitting the data to a recipient, identifying new write IOs, received in parallel with transmission of the data, that are directed to data included in the backup request, reading from the volume, only once, the data to which the new write IOs are directed, writing the data read from the volume to multiple temporary logs, where each of the temporary logs is associated either with a respective one of the bitmap fragments, or with a respective one of the multiple backup streams, and transmitting the data from the temporary log to the recipient, wherein the transmitted data comprises the backup.

Growing community of inventors

Be'er Sheba, Israel

Nomi Michaels