diskHealthCheckOK(ctx, err)
	}

	// If we have oldDataDir then we must preserve current xl.meta
	// as backup, in-case needing renames().
	if res.OldDataDir != "" {
		if contextCanceled(ctx) {
			return res, ctx.Err()
		}

		// preserve current xl.meta inside the oldDataDir.
		if err = s.writeAll(ctx, dstVolume, pathJoin(dstPath, res.OldDataDir, xlStorageFormatFileBackup), dstBuf, true, skipParent); err != nil {

			resp, err := disks[index].RenameData(ctx, srcBucket, srcEntry, fi, dstBucket, dstEntry, RenameOptions{})
			if err != nil {
				return err
			}
			diskVersions[index] = resp.Sign
			dataDirs[index] = resp.OldDataDir
			return nil
		}, index)
	}

	// Wait for all renames to finish.
	errs := g.Wait()

	err := reduceWriteQuorumErrs(ctx, errs, objectOpIgnoredErrs, writeQuorum)
	if err != nil {