Is ignorance of the identity of a defendant sufficient to delay the running of the statute of limitations?

"While ignorance of the existence of an injury or cause of action may delay the running of the statute of limitations until the date of discovery, the general rule in California has been that ignorance of the identity of the defendant is not essential to a claim and therefore will not toll the statute. . . . Aggrieved parties generally need not know the exact manner in which their injuries were 'effected, nor the identities of all parties who may have played a role therein.' " (Bernson v. Browning-Ferris Industries (1994) 7 Cal.4th 926, 932, italics added.)

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