defer cancel()

	poolErrs := make([][]error, len(z.serverPools))
	for idx, erasureSet := range z.serverPools {
		if opts.Pool != nil && *opts.Pool != idx {
			continue
		}
		if z.IsSuspended(idx) {
			continue
		}
		errs := make([]error, len(erasureSet.sets))
		wk, _ := workers.New(3)
		for idx, set := range erasureSet.sets {
			if opts.Set != nil && *opts.Set != idx {
				continue
			}

		{serverType: "ErasureSD", signer: signerV4, secure: true},
		// Init and run test on Erasure backend.
		{serverType: "Erasure", signer: signerV4},
		// Init and run test on ErasureSet backend.
		{serverType: "ErasureSet", signer: signerV4},
	}
	testCases := []*TestSuiteIAM{}
	for _, bt := range baseTestCases {
		testCases = append(testCases,
			newTestSuiteIAM(bt, false),
			newTestSuiteIAM(bt, true),
		)

	ErasureTestStr string = "Erasure"

	// ErasureSetsTestStr is the string which is used as notation for Erasure sets object layer in the unit tests.
	ErasureSetsTestStr string = "ErasureSet"
)

const letterBytes = "abcdefghijklmnopqrstuvwxyz01234569"
const (
	letterIdxBits = 6                    // 6 bits to represent a letter index