Emc IP Holding Company LLC

Englin Koay

George Mathew

Pranay Singh

Pengju Shang

Dhawal Bhagwat

Murthy V Mamidi

In one example, a method for writing data includes receiving a write request and performing a first type of logging process in connection with the write request, and creating a corresponding first logging record. Additionally, a second type of logging process is performed in connection with the write request, and a corresponding second logging record created, where the second type of logging process is different from the first type of logging process. Next, a determination is made, as between the two logging records, which of the logging records requires the least amount of non-volatile random access memory (NVRAM), and the logging record that requires the least amount of NVRAM is written to the NVRAM.

Hybrid NVRAM logging in filesystem namespace

In some embodiments, in response to receiving an indication to warm up a SSD cache, a system identifies namespace data of a file system to be warmed up separated from content data. The system identifies one or more namespace pages of the namespace data. For each of the one or more namespace pages, the system locks the namespace page in a read-only mode and determines if the namespace page is dirty. If the namespace page is dirty, the system releases the namespace page from the read-only mode without copying the namespace page to the SSD cache. If the page is clean (i.e., not dirty) then the system copies the namespace page to the SSD cache and releases the namespace page from the read-only mode to reduce cache misses of the namespace on the SSD cache.

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Englin Koay